Test- Water (video)

Question 1

how much water is on the earth?

Answer 1

71%

Question 2

how much of the water on earth is salt water?

Answer 2

97%

Question 3

how much of the water on earth is fresh water?

Answer 3

3%

Question 4

what percent of earth’s freshwater is frozen?

Answer 4

2%

Question 5

how much freshwater is available to us?

Answer 5

1%

Question 6

is water a renewable resource?

Answer 6

yes, as long as we take care of it

Question 7

most water is used for what?

Answer 7

agriculture

Question 8

name two ways you can conserve water?

Answer 8

1. shorter showers

2. turn water off when brushing teeth

Question 9

what is the difference between unconfined and confined aquifers?

Answer 9

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

Question 10

what is another word for a confined aquifer?

Answer 10

artesian well

Question 11

how would water get into a confined aquifer?

Answer 11

usually a large water source (like a lake), and the water will just sink down into the ground and give it pressure.

Question 12

what does the permeable layer on in unconfined aquifer do?

Answer 12

filter out the water

Question 13

which aquifer is easier to get to? why?

Answer 13

unconfined, no impermeable layers of rock at the top

Question 14

what are some things that can happen to water as it moves over land?

Answer 14

runoff (pick up particles of soil and rock), sedimentation, infiltration

Question 15

what is a watershed?

Answer 15

how land is sloped so water can go into a drainage system

Question 16

what causes land substinence?

Answer 16

removing water from aquifers at a fast rate

Question 17

what does land substinence lead to?

Answer 17

sinkholes

Question 18

what is salt water intrusion?

Answer 18

salt water invading freshwater.

Question 19

where does salt water intrusion happen?

Answer 19

coastal areas

Question 20

why would salt water intrusion happen?

Answer 20

storm surges & over pumping wells

Question 21

which source of pollution can be identified?

Answer 21

point source

Question 22

what is condensation?

Answer 22

the collection of water in the atmosphere