Living By Chemistry 2e Teacher's Resource Materials © 2015 W.H. Freeman and Company/BFW

Unit 3 Weather Lesson 55 Worksheet

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Front and Center Density, Temperature, and Fronts

Name

Date Period

PurposeTo investigate how fronts affect the weather.

Part 1: Weather MapsReexamine the weather maps from Lesson 1 to answer the questions.

1. Examine the Fronts Map, Cloud Cover Map, and Precipitation Map together. Whatrelationships do you see among fronts, clouds, and precipitation?

2. Where would you expect to see warm and cold air masses on the Fronts Map? Drawthem on this map.

Cold air Warmair

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L E S S O N

55AcTIvITy

Part 2: Warm and Cold Fronts1. Why is a cold air mass denser than a warm air mass?

2. Explain why clouds might form when a warm air mass collides with a cold air mass.

3. Examine the illustration showing what happens at a cold front.

Coldfront:Coldairovertakeswarm air.

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Unit 3 Weather Lesson55 Worksheet

Living By Chemistry 2e Teacher's Resource Materials © 2015 W.H. Freeman and Company/BFW

a. Explain why warm air is pushed up by the cold front.

b. Where do clouds form when there is a cold front?

c. Where does precipitation fall when there is a cold front?

4. Examine the illustration showing what happens at a warm front.

a. What happens to the warm air when it overtakes the cold air?

b. Where do clouds form when there is a warm front?

c. Where does precipitation fall when there is a warm front?

5. Making Sense What does air density have to do with weather fronts?

6. If You Finish Early Nearly eighty percent of the air in our atmosphere is nitrogengas, N2, while water vapor makes up only 1% of the air. Why doesn’t it rain liquidnitrogen instead of rainwater?

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Warm air Coldair

Warmfront:Warmairovertakescoldair.

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