71% of earth is covered with water - ms. kube's webpage
TRANSCRIPT
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71% of Earth is covered with water
96.5% of that water is saltwater in the oceans and seas
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Only 2.5% of Earth’s water is freshwater.
68.7% of the freshwater is frozenin glaciers and ice
caps.
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30.1% of the freshwater on Earth
exists as groundwater.
Only 1.2% of all the freshwater on Earth is on
the surface in streams, ponds, and lakes.
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Worldwide, the United States uses the mostfreshwater per capita, followed by Europe.
Water Use
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Water UseWithin the United States, over half of the
freshwater used is for agriculture, followed by residential outdoor use.
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Water UseWithin an average American home, flushing toilets
use the most freshwater, followed by washing clothes and taking showers.
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Earth’s fresh water supply is continuously recycled in a process called the Water Cycle, also known as the
hydrological cycle.
Water Cycle
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Powered by radiation from the Sun, water changes from a liquid to a gas during
evaporation
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Water vapor rises in the atmosphere, collects to form clouds, and cools back into
liquid water during condensation
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Once enough water condenses in the clouds, water and falls back to Earth as
precipitation
Rain
Sleet
Snow
Hail
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When precipitation reaches the ground, some of the water soaks into the ground
through infiltration
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While the infiltrated water percolatesthrough the ground, it is filtered, cleaned, and purified, before it becomes part of the
groundwater.
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The top of the groundwater supply is called the WaterTable. Whenever the water table reaches the surface of the ground, a spring is formed and the water flows
out into streams, lakes, or the ocean.
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Some of the infiltrated water is taken up by plantsduring photosynthesis. On hot days, a lot of the
water in plants, evaporates out through the leavesduring a process called transpiration.
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During photosynthesis, carbon dioxide flows into openings in the leaves of
plants, called stoma, while oxygen and water
vapor flows out.
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At the same time, some of the infiltrated water evaporates out of the soil.
The combination of transpiration and evaporation from the soil is called evapotranspiration.
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Water that does not soak into the ground through infiltration flows over the surface of
Earth as Surface Runoff
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Surface runoff water makes it way into streamsthat eventually flow into lakes and the ocean.
Once the water is in lakes and the ocean, the process begins all over again.
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The End