Earth's Water

Science

air front

the boundary between two air masses of different temperatures

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air mass

a huge body of air with similar temperature and moisture throughout

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air pressure

the weight of the air pressing down on a surface

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anemometer

an instrument that measures wind speed

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atmosphere

the layer of gases that surround the Earth

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barometer

an instrument that measures air pressure

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climate

the average weather conditions of an area, over a long period of time

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cold front

the boundary of a mass of cold air where it slides under a mass of warm air

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condensation

the process of a gas changing into a liquid

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evaporation

the top of liquid changing into a gas

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greenhouse effect

the warming of the Earth when the atmosphere traps heat like a blanket

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humidity

the amount of water vapor in the air

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hurricane

a large tropical storm with winds of more than 74 mph

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precipitation

water that falls to Earth in any form, like rain, snow, sleet, or hail

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tornado

a spinning funnel-shaped column of wind

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warm front

the boundary where a warm air mass moves over a cold air mass

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water cycle

the constant movement of water through Earth and its atmosphere, by evaporation, condensation and precipitation

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weather

the atmospheric conditions at a specific time and place, like raining and cold

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