North Carolina Science Grade 8

Chapter 5: Water

Water

1.
Water found underground in layers of rock and sediment is called __________.
A)an aquifer
B)groundwater
C)a reservoir
D)surface water
2.
Water moves up plant stems by __________.
A)gravity
B)capillary action
C)polarity
D)density
3.
Seventy-seven percent of Earth's freshwater is __________.
A)ice
B)underground
C)in lakes
D)in rivers
4.
Boating and water skiing are examples of water used for __________.
A)transportation
B)agriculture
C)recreation
D)production
5.
Which of the following statements about water is true?
A)Warm water has more molecules per unit of volume than cold water.
B)Cold water has fewer molecules per unit of volume than warm water.
C)Cold water is less dense than warm water.
D)Warm water is less dense than cold water.
6.
Approximately __________ percent of Earth's water is freshwater available for human use.
A)90
B)one
C)ten
D)99
7.
When water is freezing, the temperature __________.
A)slowly decreases
B)slowly increases
C)rapidly decreases
D)does not change
8.
Water can form drops because of __________.
A)cohesion
B)capillary action
C)density
D)specific heat
9.
Which of the following is an example of density?
A)4.3 g/cm3
B)4.3° C
C)4.3 g
D)4.3 cm3
10.
Which form of water has the lowest density?
A)vapor
B)ice
C)solid
D)liquid
11.
Water in gas form is called __________.
A)solid
B)vapor
C)liquid
D)ice
12.
Plants depend on __________ to grow.
A)surface water
B)soil water
C)aquifers
D)groundwater
13.
Heat is measured in units called __________.
A)meters
B)calories
C)liters
D)degrees
14.
Water returns to the atmosphere by the process of __________.
A)radiation
B)evaporation
C)precipitation
D)condensation
15.
Mulching the ground around plants and installing drip tubes above plant roots are examples of conservation methods used in __________.
A)mining
B)transportation
C)agriculture
D)industry
16.
Atmospheric water vapor helps keep Earth warm by __________.
A)moving energy around
B)absorbing solar energy
C)reflecting solar radiation
D)producing clouds
17.
Because of water's __________, it cools more slowly than sand.
A)specific heat
B)density
C)calories
D)polarity
18.
Water droplets form when water vapor __________.
A)polarizes
B)evaporates
C)condenses
D)heats up
19.
Pure water freezes at __________ ° C.
A)0
B)32
C)100
D)212
20.
Water used for irrigation can come from all of the following EXCEPT __________.
A)lakes
B)rivers
C)clouds
D)underground
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