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Flashcards in Groundwater Deck (22)
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1

less than ____ percent of all water in the hydrosphere is groundwater

1

this is still 40x greater than fresh surface water

2

about half of all groundwater is found within ____ meters of the surface

750

below that there is not as much groundwater because there is so much pressure that there is not enough pore space for the water to be stored in

3

the amount of pore space in a rock depends on the rock's ______

porosity

4

groundwater is stored in the ____ _____ of a rock

pore space

5

the porosity of a rock depends on the _____ and ______ of the grains that make up a rock

shape, size

6

the ______ of a rock depends on the shape and size of the grains that make up a rock

porosity

7

if a rock has _____ size grains it has high porosity

uniform

8

a rock has high porosity if it has...

uniform sized grains

9

uniform sized grains means a rock has ______ porosity

high

10

if a rock has ______ size grains it has low porosity

heterogeneous

11

heterogenous means

grains of many different sizes

12

Porosity is the...

amount of pore space in a rock

13

Permeability is how...

connected the pores are

14

rocks that store groundwater are known as _______

aquifers

15

aquifers are usually a _______ rock

sedimentary

16

an aquifer must be both _____ and ______

porous, permeable

17

what two sedimentary rocks makes good aquifers?

sandstone and limestone

18

what is a layer of impermeable rock that confines aquifers?

aquiclude

19

Aquicludes are usually...

shale or clay

20

______ aquifers have no aquiclude above them

unconfined

water is free to rise to its natural levels

21

if you drill a well into an _____ aquifer you must pump the water to the surface because there is no pressure that's going to force the water out

unconfined

22

when groundwater is removed faster than it is replenished this is called _____ ______

groundwater mining