Question

A tornado is a type of severe cyclone. Which statement best explains how a

tornado might form?
• A. Two different air masses meet, but neither moves into the other
one, and a spiraling wind results.
• B. A cyclone becomes slower and slower as pressure differences
between areas of low and high pressure decrease.
• C. Cold, dense air flows toward warmer, less dense air, so the cold
front ends up moving faster than the warm front.
• D. A cyclone rotates faster and faster as pressure differences
between areas of low and high pressure increase.

Answer 1

Tornadoes form when warm, humid air collides with cold, dry air. The denser cold air is pushed over the warm air, usually producing thunderstorms. The warm air rises through the colder air, causing an updraft. The updraft will begin to rotate if winds vary sharply in speed or direction.