| A | B |
|---|
| The weather pattern at a certain place over a period of about 30 years is called | climate |
| The weight of the air in the atmosphere is called | air pressure or atmospheric pressure |
| The condition of the atmosphere at a certain time and place is | weather |
| The amount of water vapour in the air is called | humidity |
| Humidity is measured with a | hygrometer |
| The area between two air masses is called a | front |
| When warm air masses move toward cold air the area between the two is called a | warm front |
| Warm fronts bring | steady rain |
| When a cold air mass moves toward warm air the area between them is called a | cold front |
| Cold fronts usually bring | heavy rains and cold winds |
