Chapter 15

2. How are electrical charges distributed in storm clouds and on the ground below? a. "-" charges are in the upper part of a cloud and on the ground; "+" charges are near the base of a cloud. b. "+" charges are in the upper part of a cloud and on the ground; "-" charges are near the base of a cloud. c. "+" charges are in the lower part of a cloud, and "-" charges are on the ground. d. "-" charges are in the lower part of a cloud, and "+" charges are on the ground. e. "+" charges are throughout the cloud, and "-" charges are on the ground.

ANSWER: b [p. 469]

7. What is a wall cloud? a. a cloud that sheds a wall of rain b. a slowly rotating cloud that sags below the main storm cloud base c. a cloud that moves along the "wall" of the Rocky Mountain Front d. the vertical "wall" of the edge of a storm cloud e. a slowly rotating steep-sided stratocumulus cloud

ANSWER: b [p. 475]

9. What is the greatest danger (what causes most deaths) from a tornado? a. being picked up in the funnel and dropped b. being struck by flying debris c. being crushed under a collapsing roof d. being flung against something in the intense winds e. being in a car crash while trying to escape an oncoming tornado

ANSWER: b [p. 481]

1. What causes a cold front? a. The front of an advancing storm is abnormally cold. b. A cold air mass moves up against the Rocky Mountain Front. c. A cold air mass moves in under a warm air mass. d. A warm air mass moves in over a cold air mass. e. The jet stream moves north into central Canada.

ANSWER: c A cold air mass moves in under a warm air mass.

3. Where is a relatively safe place to be in a lightning storm? a. an open field away from a tall tree b. in a dry area under a tall tree c. in your house d. lying under your car e. driving in your car

ANSWER: c [p. 472]

5. In what direction do most mid-continent tornadoes travel along the ground? a. east b. southwest c. northeast d. northwest e. southeast

ANSWER: c [p. 474]

6. How fast do tornadoes move along the ground? a. 1 to 2 km per hour b. 5 to 10 km per hour c. 50 to 80 km per hour d. 300 km per hour e. 700 km per hour

ANSWER: c [p. 477]

4. What should you do to avoid being killed by lightning if caught out in the open in a storm with no place to take cover? a. Lie flat on the ground, so you are as low as possible. b. Stand very still, so your target is smaller. c. Run for cover under the nearest dry tree. d. Crouch down on the balls of your feet with your feet together. e. Crouch with your feet apart.

ANSWER: d [p. 473]

8. Which part of a storm is the area that is likely to form tornadoes? a. under the leading edge of the stratocumulus cloud b. immediately ahead of the heaviest rain. c. under the left edge of the storm cloud (viewed in the direction of storm travel) d. in the tailing part of the area of heaviest rain e. in the rotating winds of the trailing edge of the stratocumulus cloud

ANSWER: d [p. 475]