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A

Absorb

, 37–40, 64, 91

Air pressure

, 35, 91

Alamaro, Moshe

, 61–62

Amrose, Susan

, 81–82

Anemometer

, 33, 91

Aquifer

, 64, 91

B

Barrier island

, 60, 91

Bernitsas, Michael

, 86–87

Blade

, 84–85, 91

Boiling point

, 20, 91

C

Celsius

, 20, 28, 91

Climate

, 48–54, 91

Cloud

, 7, 32, 41–74, 91

Compass

, 34, 91

Condense

, 41–43, 45–47, 83, 91

Conserve

, 15, 61, 71, 91

Contract

, 21, 28, 31, 91

Criterion

, 86, 91

D

Dam

, 9, 57, 85–87

Decomposing organic matter

,

68, 91

Density

, 23, 29, 91

Dew

, 42, 91

Drought

, 14, 61–62, 91

E

Electricity

, 81, 85–88, 91

Energy

, 41, 46, 85–89, 91

Energy source

, 71–72, 91

Engineer

, 60, 77–82, 86–89, 91

Evaporate

, 38, 45–46, 66–67, 83, 91

Evidence

, 10–13, 91

Expand

, 21, 28, 31, 91

Experiment

, 10–13, 39–40, 62, 74

F

Float

, 22–23, 29, 91

Flood

, 57–60, 83, 91

Floodplain

, 56–60, 91

Force

, 36, 83–84, 91

Forecast

, 36, 91

Fossil fuel

, 71, 91

Freeze

, 28–29, 32, 91

Freezing point

, 20, 92

Fresh water

, 4–5, 14, 26, 63, 92

G

Gas

, 4, 38, 41, 92

Glacier

, 25–26, 92

Gram

, 10–13, 22, 92

Graph

, 39–40

Gravity

, 9, 83, 92

Groundwater

, 5, 81, 92

H

Hail

, 32, 47, 83

Heat

, 31, 41, 78, 92

Humidity

, 35–36, 92

Humus

, 68–69, 92

Hurricane

, 83, 92

I

Ice

, 4–5, 24–29, 32, 92

Iceberg

, 26, 29, 92

L

Lake

, 4–5, 27, 46, 55, 64–66, 75, 77

Liquid

, 4–5, 21, 28–29, 31, 92

Liter

, 14, 92

M

Mass

, 11–12, 22–23, 29, 92

Matter

, 9, 83, 92

Measure

, 20, 33–35, 39–40, 92

Melt

, 8, 24–27, 57, 92

Meteorologist

, 30–36, 48, 92

Mixture

, 20, 22, 92

More dense

, 23, 92

N

Natural resource

, 14, 63, 68–72, 92

Nonrenewable resource

, 71–72, 92

O

Ocean

, 3–5, 9, 26, 46–47, 53, 55, 59–60,

65, 86–89

Opinion

, 10, 13, 92

Oyanedel-Craver, Vinka

, 79–80

P

Perpetual renewable resource

,

72, 92

Pipes

, 28–29, 62, 64–65, 67

Polar zone

, 48, 92

Precipitation

, 32, 49, 92

Predict

, 30, 36, 48, 92

Property

, 69, 92

R

Rain

, 7, 32, 45, 50–57, 92. See also

Precipitation

Recycle

, 15, 63, 78, 92

Renewable resource

, 63, 70–72, 92

Reservoir

, 61–62, 85, 92

Retain

, 69, 92

Richards, Ellen Swallow

, 73–76

River

, 4, 5, 9, 25, 27, 44–46, 55–59, 64,

75, 77, 83, 86–89

Runoff

, 66, 92

S

Safety rules

, 90

Salt water

, 3, 5, 26, 63, 93. See also

Ocean

Scale

, 20, 93

Shaft

, 33–34, 84–85, 87, 93

Sink

, 22–23, 93

Sleet

, 32, 47, 83

Snow

, 8, 24–25, 27, 30, 32, 45, 47, 50,

52, 57, 83

Soak

, 8, 10–13, 93

Soil

, 8, 44–46, 68–70, 93

Solar disinfection system

(SODIS),

77–78

Solar radiation

, 78, 93

Solid

, 4, 93

Speed

, 25, 33, 93

Storm surge

, 59, 83, 93

Surface area

, 39–40, 93

Surface tension

, 6–7, 93

T

Temperate zone

, 48–54, 93

Temperature

, 20, 30–32, 35–36,

49, 93

Texture

, 69, 93

Thermometer

, 20–21, 31, 93

Tropical zone

, 48–50, 52, 93

V

Volume

, 7, 21, 23, 29, 93

W

Water

as natural resource, 68–72

as renewable resource, 71

as vital resource, 63

changes in, 21, 37–40

defined, 3

density, 23

Earth’s surface cover, 3–5

flow of, 8–9

in our cities, 66

in our homes, 64

leaving our homes, 65

power of, 83–89

purifying, 77–82

states of, 4–5, 24–29

uses for, 4, 84–85

Water conservation

, 67

Water cycle

defined, 45, 93

description of, 44–47, 83

water renewal, 63, 71

Water quality

, 64, 75, 93

Water turbine

, 83, 93

Water vapor

, 4, 37–38, 41–43,

45–46, 93

Waterwheel

, 84–85, 87, 89, 93

Weather

, 28, 30–36, 48–54, 93

Weather balloon

, 36, 93

Weigh

, 11, 93

Wetland

, 55–60, 93

Wind meter

, 33, 93

Wind vane

, 34, 93

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