QUESTION: 29

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Nancy and Sophia are studying weather in science class. Nancy tells Sophia that warm air ismore dense than cold air.
Which of the following statements proves that Nancy's belief is false?

A cold air mass can push a warm air mass upward.
A warm air mass cannot form clouds.
Cool, dry air can move around warm, moist air.
Cold, dry air pushes clouds past a front.
Precipitation forms where cold and warm air masses meet.

Answer(s): A

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QUESTION: 30

Dr. Mullin collected data on the number of leaves that fell from a tree. She noticed that the number of leaves that fell varied substantially during the seasons of the year. The graph at the left describes Dr. Mullin's findings.

Based on the information and graph, which action would best help explain the data?