Lesson 7

Density, Temperature, and Fronts

Air masses - form over different regions of land and ocean; have consistent temperatures and moisture density

Cold Fronts

• More dense because the colder it is the more compact
• Cold air masses overtake warm air masses
• Clouds along with rain form right where the differing fronts meet
• Cold air sinks below the warm air mass because it is more dense

Warm Fronts

• Less dense because warmer means expanding
• Warm air mass overtakes the cold air mass
• Clouds form below the warm air where the cold air mass is
• Rain can occur inside the cold air mass
• Warm air rises above the cold front forcing it down because it is less dense

Practice Problems

1. Hot air rises because the warmer the gas particles are the faster they move and expand so they become less dense. This means the warm air isn't as heavy so it rises.

4. Rainy cloudy and cold

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