| A | B |
|---|
| weather | condition of Earth's atmoshpere |
| atmosphere | the layer of gases that surround Earth |
| ozone | a form of oxygen with three atoms,not the usual two |
| water vapor | water in the form of a gas |
| pressure | a force pushing on something |
| density | mass in a given volume |
| air pressure | weight of air |
| mercury barometer | consists of a glass tube open at the bottom and partially filled with mercury |
| aneroid barometer | has an airtight metal chamber that is sensitive to chages in air pressure |
| altitude | elevation, distance above sea level |
