| A | B |
|---|
| air pressure | the weight of air pressing down on everything |
| atmosphere | the air that surrounds the earth; a layer of gases |
| cirrus clouds | a high feathery cloud made of ice crystals: thin wispy clouds that form high in the atmosphere |
| cold front | a mass of cold air that is moving into a mass of warm air |
| cumulonimbus clouds | huge vertical clouds that can produce thunderstorms, hail and sometimes tornadoes |
| cumulus clouds | puffy, white clouds with a flat bottom; fluffy clouds that signal fair weather |
| front | a place where one air mass meets and pushes aside another air mass |
| high pressure | a mass of cool dry air that brings fair weather light winds resulting in sunny skies |
| humidity | the amount of water vapor in the air |
| land breeze | the natural flow of air moving from the coast toward the ocean |
| sea breeze | the natural flow of air moving from the ocean toward the coast |
| low pressure | a mass of warm moist air that brings stormy weather with strong winds |
| stratus clouds | Low-lying gray and sheet like clouds that often produce drizzle |
| warm front | a mass of warm air that is moving into a mass of cold air |
