Groundwater

Question 1

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

Answer 1

1

this is still 40x greater than fresh surface water

Question 2

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

Answer 2

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

Question 3

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

Answer 3

porosity

Question 4

groundwater is stored in the ____ _____ of a rock

Answer 4

pore space

Question 5

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

Answer 5

shape, size

Question 6

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

Answer 6

porosity

Question 7

if a rock has _____ size grains it has high porosity

Answer 7

uniform

Question 8

a rock has high porosity if it has…

Answer 8

uniform sized grains

Question 9

uniform sized grains means a rock has ______ porosity

Answer 9

high

Question 10

if a rock has ______ size grains it has low porosity

Answer 10

heterogeneous

Question 11

heterogenous means

Answer 11

grains of many different sizes

Question 12

Porosity is the…

Answer 12

amount of pore space in a rock

Question 13

Permeability is how…

Answer 13

connected the pores are

Question 14

rocks that store groundwater are known as _______

Answer 14

aquifers

Question 15

aquifers are usually a _______ rock

Answer 15

sedimentary

Question 16

an aquifer must be both _____ and ______

Answer 16

porous, permeable

Question 17

what two sedimentary rocks makes good aquifers?

Answer 17

sandstone and limestone

Question 18

what is a layer of impermeable rock that confines aquifers?

Answer 18

aquiclude

Question 19

Aquicludes are usually…

Answer 19

shale or clay

Question 20

______ aquifers have no aquiclude above them

Answer 20

unconfined

water is free to rise to its natural levels

Question 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

Answer 21

unconfined

Question 22

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

Answer 22

groundwater mining