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4th Grade Science

Harcourt - Unit D, Chapter 1 - Weather

Vocabulary WordDefinition
atmosphere The layer of air that surrounds our planet.
air pressure Particles of air pressing down on the Earth’s surface.
troposphere The layer of atmosphere closest to the Earth, where most weather occurs.
stratosphere The layer of atmosphere that contains ozone and is located above the trophosphere.
greenhouse effect The warming of Earth caused by the atmosphere trapping thermal energy from the sun.
air mass A huge body of air which has similar temperature and moisture that is similar to the water or land over which it was formed.
front The border where two air masses meet.
cirrus Wispy, high-altitude clouds that are made up of ice crystals.
cumulus Puffy cotton-ball clouds that begin to form when water droplets condense at high altitude.
cumulonimbus Towering, dark rain clouds with a nimbus, or halo, of gray-white.
stratus Dark gray clouds that form a low layer and sometimes bring light rain or snow showers.
barometer An instrument that measures air pressure.
humidity The amount of water vapor in the air.
hygrometer A tool to measure moisture in the air.
mesosphere The layer of atmosphere that is located above the stratosphere.
thermosphere The hot, outermost layer of the atmosphere.
Created by: PMA4JC
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