| A | B |
|---|
| the mass of air surrounding a planet | Atmosphere |
| the pressure exerted by the atmosphere on all objects within it | Atmospheric pressure |
| an instrument used to measure atmospheric pressure an instrument used to measure atmospheric pressure | Barometer |
| the lower lay of earth’s atmosphere, which exists from ground level to roughly 80 kilometers | Homosphere |
| the upper layer of earth’s atmosphere, which exists higher than roughly 80 kilometers (50 miles) above sea level | Heterosphere |
| the region of the atmosphere that extends from ground level to roughly 11 kilometers (7 miles) above sea level | Troposphere |
| the region of the atmosphere that spans altitudes of roughly 11 kilometers to 48 kilometers (30 miles) | Stratosphere |
| the region of the atmosphere that spans altitudes of roughly 48 kilometers to 80 kilometers (50 miles) | Mesophere |
| narrow bands of high-speed winds that circle the earth, blowing from west to east | Jet streams |
| energy that is transferred as a consequence of temperature differences | Heat |
| a measure of the energy of random motion in a substance’s molecules | Temperature |
| the region of atmosphere between altitudes of roughly 80 kilometers and 460 kilometers | Thermosphere |
| the region of the atmosphere above an altitude of roughly 460 kilometers | Exosphere |
| the region of the atmosphere between the altitude of roughly 65 kilometers | Ionosphere |
