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Chapter 8 Vocabulary
Water
25
Science
4th Grade
10/05/2010

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Term
atmosphere
Definition
the blanket of gases that surrounds the Earth
Term
water vapor
Definition
a gas in the Earth's atmosphere
Term
ice cap
Definition
a thick sheet of ice covering a large area of land
Term
soil water
Definition
water that soaks into the ground
Term
groundwater
Definition
water stored in the cracks of underground rocks
Term
evaporation
Definition
process in which water particles change from liquid to gas
Term
condensation
Definition
process in which water particles change from a gas to a liquid
Term
cloud
Definition
a mass (collection) of tiny droplets of condensed water
Term
precipitation
Definition
water in the Earth's atmosphere that falls to Earth as rain, snow, hail, or sleet
Term
freeze
Definition
when water particles slow down, lose heat, and change from a liquid to a gas
Term
melt
Definition
when water particles absorb heat energy and change from a solid to a gas
Term
water cycle
Definition
the constant movement of water between Earth's surface and the air changing from liquid to gas to liquid
Term
current
Definition
a large stream of water that flows in the ocean
Term
tide
Definition
the rise and fall of the ocean water levels
Term
wave
Definition
the up and down movement of water
Term
pore space
Definition
the space between soil particles
Term
water table
Definition
the upper area of the groundwater
Term
runoff
Definition
the water that flows over the Earth's surface but does not evaporate or soak into the ground
Term
transpiration
Definition
a plants release of excess water vapor
Term
irrigation
Definition

a way to get water into the soil by artificial means

ex.) Farmers use irrigation to water their crops.

Term
water treatment plant
Definition
a place where water is made clean and pure
Term
filtration
Definition
the passing of water through materials that remove dirt and pollution
Term
sewer
Definition
a large pipe that carries sewage to a sewage treatment plant
Term
septic tank
Definition
an underground tank in which sewage is broken down by bacteria
Term
water conservation
Definition
to save water
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