1) 1. Which air mass has more weight per unit of volume? a) cool air b) warm air c) all of the above 2) 2. Which air mass has higher air pressure? a) cool air masses b) warm air masses c) none 3) 1. In the Northern Hemisphere, how does air move in a high- pressure system? a) It rises at the center and spirals counterclockwise around and towards the center b) It sinks at the center and spirals clockwise around and away from the center 4) 2. How do you think air moves in a low-pressure system? a) It rises at the center and spirals counterclockwise around and towards the center b) It sinks at the center and spirals clockwise around and away from the center

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