Test- Water (video)
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how much water is on the earth?
71%
how much of the water on earth is salt water?
97%
how much of the water on earth is fresh water?
3%
what percent of earth’s freshwater is frozen?
2%
how much freshwater is available to us?
1%
is water a renewable resource?
yes, as long as we take care of it
most water is used for what?
agriculture
name two ways you can conserve water?
• shorter showers 2. turn water off when brushing teeth
what is the difference between unconfined and confined aquifers?
confined- two layers of impermeable rock (one on top, one on bottom) unconfined- impermeable layer of rock on the bottom, permeable layer on the top
what is another word for a confined aquifer?
artesian well
how would water get into a confined aquifer?
usually a large water source (like a lake), and the water will just sink down into the ground and give it pressure.
what does the permeable layer on in unconfined aquifer do?
filter out the water
which aquifer is easier to get to? why?
unconfined, no impermeable layers of rock at the top
what are some things that can happen to water as it moves over land?
runoff (pick up particles of soil and rock), sedimentation, infiltration
what is a watershed?
how land is sloped so water can go into a drainage system
what causes land substinence?
removing water from aquifers at a fast rate
what does land substinence lead to?
sinkholes
what is salt water intrusion?
salt water invading freshwater.
where does salt water intrusion happen?
coastal areas
why would salt water intrusion happen?
storm surges & over pumping wells
which source of pollution can be identified?
point source
what is condensation?
the collection of water in the atmosphere