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Module #3 (Yr 2)

Physical Science Mod #3

TermDefinition
Atmosphere The mass of air surrounding a planet.
Atmospheric Pressure The pressure exerted by the atmosphere on all objects within it
Barometer An instrument used to measure atmospheric pressure.
Homosphere The lower layer of earth's atmosphere, which exists from ground level to roughly 80 kilometers (50 mi) above sea level.
Heterosphere The upper layer of earth's atmosphere, which exists higher than roughly 80 km (50 mi) above sea level.
Troposphere The region of the atmosphere that extends from ground level to roughly 11 km (7 mi) above sea level.
Stratosphere The region of the atmosphere that spans altitudes of roughly 11 km (7 mi) to 48 km (30 mi) above sea level.
Mesophere The region of the atmosphere that spans altitudes of roughly 48 km (30 mi) to 80 km (50 mi) above sea level.
Jet Streams Narrow bands of high-speed winds that circle the earth, blowing from west to east.
Heat Energy that is transferred as a consequence of temperature differences.
Temperature A measure of the energy of random motion in a substance's molecules.
Thermosphere The region of the atmosphere between altitudes of roughly 80 km (50 mi) and 460 km (285 mi).
Exosphere The region of the atmosphere above an altitude of roughly 460 km (285 mi).
Ionosphere The region of the atmosphere between the altitudes of roughly 65 km (40 mi) and 330 km (205 mi), where the gases are ionized.
ATM Atmosphere unit used to measure atmospheric pressure; relative to sea level pressure.
Created by: CMuny
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