| A | B |
|---|
| Atmosphere | layer of gases that surrounds the earth |
| Thermosphere | Outermost layer of the atmosphere |
| Global Winds | Winds that blow over a large area |
| Local Winds | Winds that blow over a small area |
| Doldrums | Area near the equator; characterized by little or no wind |
| Humidity | Measure of the amount of water vapor in the air |
| Condensation | Process where molecules of water vapor in the air become liquid water |
| Stationary Front | Cold and warm air masses meet but neither one can move the other |
| Snow | Water vapor that turns into ice crystals |
| Drought | Long periods of unusually low precipitation |
| Precipitation | Any form of water that falls from the clouds and reaches Earth's surface |
| Front | When a heavy air mass meets a lighter air mass |
| Warm Front | Moving warm air mass collides with a slow-moving cold air mass; warm air moves over the cold air |
| Air Mass | a huge body of air that has similar temperature, humidity, and air pressure throughout it |
