Question

which of the following is not a condition required for all thunderstorms to form?

a. a typhoon

b. rising air

c. moisture in the atmosphere

d. unstable air

Explanation:

Thunderstorms require rising air, atmospheric moisture, and unstable air (conditions for convection and cloud/rain formation). A typhoon is a specific type of intense tropical storm, not a universal requirement for all thunderstorms—many thunderstorms form without typhoons.

Answer:

A. A typhoon