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Diagram

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-Three major ways

1. Withdraw freshwater at rates faster than nature can replenish it from streams, lakes, and aquifers

2. Clear vegetation for agriculture, mining, etc. and replace with concrete, asphalt, etc. causing increased runoff, reduced infiltration to resupply groundwater, accelerated top-soil erosion, and more risk of flooding

3. Drain wetlands for farming/urban development. Wetlands act like sponges and prevent overflows of water. Removing them increases flooding.

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-The water cycle can be viewed as a cycle of natural renewal of water quality

-Evaporation and precipitation act as naturally distill earth's water, removing impurities

-Also filtered via chemical and biological processes above and below earth's surface

-Mostly by decomposer bacteria

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-Most of the water that falls on terrestrial ecosystems becomes surface runoff.

-This water flows into streams, which eventually carry water back to lakes and oceans where they evaporate once more.

-Some is converted to ice and stored in glaciers.

-Some sinks through the soil and permeable rock formations to the underground layers of rock, sand, and gravel called aquifers.

-Water found under the ground here is classified as groundwater.

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Powered by evaporation, precipitation, and transpiration

Evaporation- Solar energy converts liquid water into water vapor in the atmosphere

Precipitation- gravity draws water in atmosphere back to the surface as rain, snow, sleet , or dew.

Transpiration- Process of plants absorbing water through its roots and then give off water vapor through their leaves. 90% of water evaporated  from the surface of plants thanks to transpiration.

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Also known as the hydrologic cycle, the water cycle is based around collecting, purifying, and redistributing a fixed, unchanging supply of water.