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Glossary of Apologia Physical Science, Module 3 2

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atmosphere
the mass of air surrounding a planet
atmospheric pressure
the pressure exerted by the atmosphere on all objects within it
homosphere
the lower layer of earth's atmosphere, which exists from ground level to roughly 80 kilometers (50 miles) above sea level
heterosphere
the upper layer of earth's atmosphere, which exists higher than 80 kilometers (50 miles) above sea level
troposphere
the region of the atmosphere that extends from ground level to roughly 11 kilomethers (7 miles)above sea level
stratosphere
the region of the atmosphere that spans altitudes of 11 kilometers to 48 kilometers (30 miles)
mesosphere
the region of the atmosphere that spans altitudes of 48 kilometers to 80 kilometers (50 miles)
jet streams
narrow bands of high-speed winds that circle the earth, blowing from west to east
heat
energy that is being transferred
temperature
a measure of the energy of motion in a substance's molecules
thermosphere
the region of the atmosphere between altitudes of 80 kilometers and 460 kilometers
exosphere
the region of the atmosphere above an altitude of 460 kilometers
ionosphere
the region of the atmosphere between the altitudes of 65 kilometers and 330 kilometers where the gases are ionized
barometer
an instrument used to measure atmospheric pressure

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