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Directions: Read the passage, then answer the questions. Answer multiple choice questions by circling the letter of the answer that you select. Write your answer to the Read, Think, and Explain question on the lines provided.
1. Winds are caused by:
A. Varying rates of gas flow
B. Altitude
C. Horizontal variations in air pressure
D. Differences in air pressure
Answer: C
2. What does a wind vane measure?
A. Wind direction
B. Wind velocity
C. Wind speed
D. Wind pressure
Answer: A
3. The difference between air and wind is:
A. Direction
B. Motion
C. Temperature
D. Density
Answer: B
4. How do sailors measure wind during oceanic expeditions?

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