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The Water Cycle, Essay Example

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Water is an important element for the survival of living things. The hydrologic cycle refers to the precipitation and evaporation of water from the atmosphere and back to the earth. Water on earth is mostly found in the ocean, which covers over 70% of the earth’s surface and is the source for the major reservoir. In fact, the oceans contain about 97% of the earth’s available water. The hydrologic cycle is driven through solar energy, which causes the water to evaporate into the atmosphere and return to the earth’s surface in the form of precipitation via gravity. Water that falls onto the land can be absorbed through living organisms, such as plants. Water molecules taken up by plants are returned to the atmosphere in form of evaporation from leaves. Other water molecules are absorbed into the water and undergo photosynthesis through combining with carbon dioxide resulting in high energy molecules referred to as glucose. These glucose molecules are then further broken down during cellular respiration of living organisms into water and carbon dioxide and released back into the atmosphere.

The patterns of both precipitation and evaporation result in the distribution of plants on the earth’s surface. For instance, this change in hydrologic cycle can be observed in different types of habitats, such as the desert or rain forest. In deserts, there is a decrease observed in living communities due to the decrease in biological productivity from the lack of water. On the other hand in rain forests, there is an abundance of water resulting in an increased biological productivity. In these habitats, therefore, different types of plant species and abundance occur. Changes in the hydrologic cycle could results in changes of plant communities in these areas, which thereby effect the distribution of plants on earth.

Living organisms in an ecosystem require both energy and nutrients in order to maintain life activities essential to living organisms, such as growth, development and reproductions. Plants are key to the cycle of energy and nutrients within an ecosystem. The plants capture sunlight and convert the sunlight into chemical energy through the process of photosynthesis. The energy captured through the plants is transferred through the food chain starting with the herbivores. The herbivores eat plants and obtain energy. Carnivore animals eat the herbivores to obtain energy. Scavengers obtain energy from left over animal remains. Finally, decomposers obtain energy through decaying material. Sunlight provides the energy that powers life. Nutrients and C N P H20 enter the ecosystem via the non-living components of the planet, such as the atmosphere, earth, or ocean. Solar energy continually bombards the earth and provides a limitless source of energy. This flow of energy is limitless since the energy provided from the sun is limitless. However, the nutrients essential for living organisms is limited. For instance, the earth only contains a certain amount of available Carbon, Phosphorus, or Nitrogen. The process of photosynthesis provides 1/7 th of the available carbon. Therefore, if cellular respiration were to discontinue and carbon dioxide was not released into the atmosphere, energy for life would also discontinue, as the availability of Carbon would decrease or end for the uptake of plants. Therefore, the flow of energy and the cycling of nutrients play major roles in the populations within an ecosystem.

The differences in ecosystems depend of two different types of factors. These are abiotic and biotic factors. The abiotic factors refer to components such as non-living things such as water and light. The biotic factors are the living community of organisms. Different habitats are comprised of different abiotic and biotic factors. In a swamp, the most important abiotic factor is water. The water in a swamp has a huge biotic community for micro biotic organisms, such as animal and plant-like protists, fish, plants, insects, amphibians, and reptiles. Birds and mammals also utilize the swamps as well. All of the biotic community comprises the biotic factors.

Matter and energy flow through an ecosystem when organisms feed on one another, making up the food chain. Food producers are the first chain, such as plants and algae that capture sunlight and convert chemical energy to food via photosynthesis. After the food producers, are the consumers. Consumers consume food producers; therefore, they eat the plant material. Next are the second order consumers, third order consumers and decomposers.

Pyramids were developed to illustrate the energy flow through an ecosystem with the producers on the bottom, consumers, 2 nd order consumers, and third order consumers at the top. This pyramid showed that 16% of the energy is passed on to the consumers, 11% to the secondary consumers, and only 5% to the third order consumers.

The Carbon cycle moves through ecosystems starting with air, since it contains carbon dioxide. Plants absorb carbon dioxide and break it down to glucose and oxygen. Carbon dioxide also diffuses into water for aquatic plants. Some of the Carbon atoms are used to build body tissue and other molecules are returned back to the atmosphere. Carbon is also released back to the environment through the burning of wood or fossil fuels. Decomposers also return Carbon to the atmosphere as well. All of these components affect the carbon cycle.

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The Process of the Water Cycle Research Paper

Introduction, water cycle process, works cited.

Nature comprises many processes that recycle various elements to avoid human wastage. Nature does not waste any of its elements and recycles them all including water, air and organic fertility. Recycling of natural elements occurs in order to maintain ecological balance for survival of all living species.

However, human beings have meddled with nature so much that problems such as depletion of ozone layer and global warming are inflicting the human race adversely (Kalman and Sjonger 11). An example of a process in which nature recycles one of its constituent elements is the water cycle. By definition, the water cycle is a continuous movement of water between the earth surface and the atmosphere (Kalman and Sjonger 11).

The water moves from water bodies such as oceans and rivers into the atmosphere and vice versa. It involves several states of matter including solid, gas and liquid in which water changes its form in an unending cycle of precipitation (Kalman and Sjonger 2). The cycle involves several steps that include evaporation, precipitation, run-off and percolation. Each of these steps plays a role in continuing the water cycle.

They include evaporation, condensation, precipitation, infiltration, sub-surface flow and run-off (Olien 8). In all these steps, water is converted into different states of matter including liquid, gas and solid. Heat exchange is one of the processes that are involved in all the steps. In each of these steps, heat is either lost or gained.

Evaporation

This is the process by which water changes from liquid form to gaseous form (Olien 9). It is the primary process that drives the movement of water from water bodies into the atmosphere in form of water vapor. The main water bodies include oceans, sea, lakes, rivers, dams, streams and ponds.

They provide approximately 90% of the vapor in the atmosphere. The other 10% comes from plants through the process of transpiration (Olien 9). Evaporation takes place when heat from solar energy heats up water in water bodies and causes it to change from liquid to gas. On the other hand, evapotranspiration is the process of water release from the surface of plants and soil due to evaporation (Olien 10).

Transpiration contributes a very low percentage of water vapor in the water cycle. Evaporation is the main process that drives the water cycle. Afterwards, the water vapor rises to the atmosphere and the next step of condensation begins. Research has established that after water molecules rises into the atmosphere, they spend approximately 10 days before being released as precipitation.

Condensation

This is the process by which water vapor changes from vapor into liquid, and is the reverse process of evaporation (Olien 11). Condensation plays a significant part in the water cycle because it results in the formation of clouds. After clouds are formed, they possess the ability to produce precipitation.

Precipitation is the main route through which water returns to the earth surface after the process of evaporation (Olien 11). In times when clouds are not visible, water is still present but in the form of vapor and small water droplets.

Clouds are formed from the combination of these water droplets with atmospheric elements such as dust, smoke and salt. They form tiny cloud droplets that enlarge into clouds as more droplets combine with atmospheric elements. Cloud droplets have different sizes that range from 10 microns to 5 millimeter (Olien 12).

This process takes place in the higher parts of the atmosphere because the weather conditions found there encourage condensation. This is because temperatures are cooler than the lower parts of the atmosphere. As water droplets coalesce, clouds and precipitation may form at the same time. Precipitation refers to clouds in either liquid or solid form falling to the surface of the earth from the clouds (Olien 13).

Precipitation

Precipitation refers to the process by which water is discharged from the atmosphere in a liquid or solid form into the surface of the earth, be it land or water surface (Kalman and Sjonger 16). Precipitation is released from the atmosphere in many forms that include snow, hail, freezing rain, sleet or rain.

It is the main channel that returns water into the surface of the earth. In most cases, precipitation is released as rain. Some precipitation is released from the atmosphere in form of snow, which accumulates in certain places on the ground to form glaciers and icecaps. When temperatures rise during spring, they melt and the water flows back into water bodies.

These structures store water for long periods. Clouds comprise water vapor, which accumulates over a long period to form precipitation (Kalman and Sjonger 16). Precipitation happens when these droplets gain a fall velocity that is greater than the cloud updraft speed. This takes a long time because a single raindrop is made by a combination of millions of tiny cloud droplets.

Surface run-off

This is the runoff of precipitation on the surface of the earth (Kalman and Sjonger 18). When rain hits an impervious surface on the ground, it flows over the surface. This water then flows back into water bodies and evaporates to continue the cycle. It flows into lakes, rivers and streams, from which t floes into the oceans.

Approximately, a complete water cycle takes 9 days. During runoff, water may infiltrate the ground, evaporate or flow back into water bodies. Only about 30% of precipitation that falls from the atmosphere flows back into the oceans. The other 70% evaporates, infiltrates the ground or is transpired (Olien 20). Human beings can also divert surface runoff to desired places for use in agriculture.

Infiltration

This refers to the process of water movement from the earth surface into the ground. A small portion of infiltrated water is held by the shallow soil layer from which it flows horizontally and vertically through the soil layer into the atmosphere (Olien 21). Some water seeps through the ground surface and flows into streams while the rest infiltrates further into the ground and replenishes the ground-water aquifers.

If these aquifers are porous, then people can drill water holes into the aquifers to draw water for domestic and agricultural uses (Kalman and Sjonger 23). Water that infiltrates into the ground stays there for some time before seeping into streams or moving vertically to the surface from where it evaporates.

Ground water storage and discharge

Some water infiltrates into the deep regions of the earth surface and is stored there for long periods. Despite being trapped in the depths of the earth, the water moves slowly since it is part of the water cycle. Ground water is stored in structures known as aquifers. To participate effectively in the water cycle, ground water seeps through the ground and enters the main water bodies by horizontal movement.

The structure of quifers and confining soil and rock layers are the main factors that determine the speed of groundwater movement. In addition, the movement of the water depends on the permeability and porosity of the soil constituents that hold the water. Because of gravity, groundwater moves further downwards into the ground surface and may never move back to the water cycle. It remains trapped in the ground for thousands of years.

Nature comprises many processes that recycle various elements for reuse. Nature has no wastage and recycles all elements including water, air and organic fertility. An example of a process in which nature recycles one of its constituent element is the water cycle. By definition, water cycle is a continuous movement of water between the earth surface and the atmosphere.

The water moves from water bodies found on the surface of the earth to the atmosphere and vice versa. Steps involved in the water cycle include evaporation, condensation, precipitation, infiltration, sub-surface flow and run-off. In all these steps, water is converted into different states of matter including liquid, gas and solid. Water evaporates from the surface of the earth, moves into the atmosphere as vapor and condenses to form clouds.

These clouds fall back to the earth surface as precipitation in form of rain, sleet or snow. Some water seeps through the ground surface and flows into streams while the rest infiltrates further into the ground and replenishes the ground-water aquifers. It stays there for some time before seeping into streams or moving vertically to the surface from where it evaporates.

The water cycle is important in maintaining the right amount of water in nature. In addition, it facilitates the storage of underground water that is used when there is no precipitation or during droughts. Some water infiltrates into the deep regions of the earth surface and is stored there for long periods. Despite being trapped in the depths of the earth, the water moves slowly since it is part of the water cycle.

Kalman, Bobbie and Sjonger, Rebecca. The Water Cycle . New York: Crabtree Publishing Company, 2006. Print.

Olien, Rebecca. The Water Cycle . New York: Capstone, 2005. Print.

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Hydrologic Cycle

The water cycle describes how water is exchanged (cycled) through Earth's land, ocean, and atmosphere.

Earth Science, Meteorology, Geography, Physical Geography, Geology

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The water cycle describes how water is exchanged (cycled) through Earth's land, ocean, and atmosphere. Water always exists in all three phases, and in many forms—as lakes and rivers , glaciers and ice sheets , oceans and seas, underground aquifers , and vapor in the air and clouds .

Evaporation , Condensation , and Precipitation

The water cycle consists of three major processes: evaporation, condensation, and precipitation.

Evaporation

Evaporation is the process of a liquid's surface changing to a gas. In the water cycle, liquid water (in the ocean, lakes, or rivers) evaporates and becomes water vapor.

Water vapor surrounds us, as an important part of the air we breathe. Water vapor is also an important greenhouse gas . Greenhouse gases such as water vapor and carbon dioxide insulate Earth and keep the planet warm enough to maintain life as we know it. Increasing amounts of greenhouse gases in the atmosphere also contribute to global warming.

The water cycle 's e vaporation process is driven by the sun. As the sun interacts with liquid water on the surface of the ocean, the water becomes an invisible gas (water vapor ). E vaporation is also influenced by wind , temperature , and the density of the body of water.

Condensation

Condensation is the process of a gas changing to a liquid. In the water cycle, water vapor in the atmosphere condenses and becomes liquid.

Condensation can happen high in the atmosphere or at ground level. Clouds form as water vapor condenses, or becomes more concentrated (dense). Water vapor condenses around tiny particles called cloud condensation nuclei (CCN) . CCN can be specks of dust, salt, or pollutants . Clouds at ground level are called fog or mist.

Like e vaporation , condensation is also influenced by the sun. As water vapor cools, it reaches its saturation limit, or dew point . Air pressure is also an important influence on the dew point of an area.

Precipitation

As is the case with evaporation and condensation, precipitation is a process. Precipitation describes any liquid or solid water that falls to Earth as a result of condensation in the atmosphere. Precipitation includes rain, snow, and hail.

Fog is not precipitation. The water in fog does not condense sufficiently to precipitate, or liquefy and fall to Earth. Fog and mist are a part of the water cycle called suspensions: They are liquid water suspended in the atmosphere.

Precipitation is one of many ways water is cycled from the atmosphere to the earth or ocean.

Other Processes

Evaporation, condensation, and precipitation are important parts of the water cycle. However, they are not the only ones.

Runoff , for instance, describes a variety of ways liquid water moves across land. Snowmelt , for example, is an important type of runoff produced as snow or glaciers melt and form streams or pools.

Transpiration is another important part of the water cycle . Transpiration is the process of water vapor being released from plants and soil. Plants release water vapor through microscopic pores called stomata . The opening of stomata is strongly influenced by light, and so is often associated with the sun and the process of e vaporation . Evapotranspiration is the combined components of e vaporation and transpiration , and is sometimes used to evaluate the movement of water in the atmosphere.

States of Water

Through the water cycle, water continually circulates through three states: solid, liquid, and vapor.

Ice is solid water. Most of Earth's fresh water is ice, locked in massive glaciers, ice sheets, and ice caps .

As ice melts, it turns to liquid. The ocean, lakes, rivers, and underground aquifers all hold liquid water.

Water vapor is an invisible gas. Water vapor is not evenly distributed across the atmosphere. Above the ocean, water vapor is much more abundant, making up as much as four percent of the air. Above isolated deserts, it can be less than one percent.

The Water Cycle and Climate

The water cycle has a dramatic influence on Earth's climate and ecosystems .

Climate is all the weather conditions of an area, evaluated over a period of time. Two weather conditions that contribute to climate include humidity and temperature . These weather conditions are influenced by the water cycle .

Humidity is simply the amount of water vapor in the air. As water vapor is not evenly distributed by the water cycle, some regions experience higher humidity than others. This contributes to radically different climates. Islands or coastal regions, where water vapor makes up more of the atmosphere, are usually much more humid than inland regions, where water vapor is scarcer.

A region's temperature also relies on the water cycle . Through the water cycle , heat is exchanged and temperatures fluctuate . As water e vaporates , for example, it absorbs energy and cools the local environment. As water condenses, it releases energy and warms the local environment.

The Water Cycle and the Landscape

The water cycle also influences the physical geography of Earth. Glacial melt and erosion caused by water are two of the ways the water cycle helps create Earth's physical features.

As glaciers slowly expand across a landscape , they can carve away entire valleys , create mountain peaks, and leave behind rubble as big as boulders. Yosemite Valley , part of Yosemite National Park in the U.S. state of California, is a glacial valley . The famous Matterhorn, a peak on the Alps between Switzerland and Italy, was carved as glaciers collided and squeezed up the earth between them. Canada's "Big Rock" is one of the world's largest " glacial erratics ," boulders left behind as a glacier advances or retreats.

Glacial melt can also create landforms . The Great Lakes , for example, are part of the landscape of the Midwest of the United States and Canada. The Great Lakes were created as an enormous ice sheet melted and retreated, leaving liquid pools.

The process of erosion and the movement of runoff also create varied landscapes across Earth's surface. Erosion is the process by which earth is worn away by liquid water, wind, or ice.

Erosion can include the movement of runoff. The flow of water can help carve enormous canyons, for example. These canyons can be carved by rivers on high plateaus (such as the Grand Canyon, on the Colorado Plateau in the U.S. state of Arizona). They can also be carved by currents deep in the ocean (such as the Monterey Canyon, in the Pacific Ocean off the coast of the U.S. state of California).

Reservoirs and Residence Time

Reservoirs are simply where water exists at any point in the water cycle. An underground aquifer can store liquid water, for example. The ocean is a reservoir. Ice sheets are reservoirs. The atmosphere itself is a reservoir of water vapor.

Residence time is the amount of time a water molecule spends in one reservoir. For instance, the residence time of "fossil water," ancient groundwater reservoirs, can be thousands of years.

Residence time for water in the Antarctic ice sheet is about 17,000 years. That means that a molecule of water will stay as ice for about that amount of time.

The residence time for water in the ocean is much shorter—about 3,200 years.

The residence time of water in the atmosphere is the shortest of all—about nine days.

Calculating residence time can be an important tool for developers and engineers. Engineers may consult a reservoir's residence time when evaluating how quickly a pollutant will spread through the reservoir, for instance. Residence time may also influence how communities use an aquifer.

Breaking the Cycle The water cycle can change. Glacial retreat is the process in which glaciers melt faster than their ice can be replaced by precipitation. Glacial retreat limits the amount of fresh water available on Earth. We are experiencing the fastest rate of glacial retreat in recorded history.

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Understanding The Water Cycle: A Fundamental Process

Category: Environment
Topic: Water , Water Cycle

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