(Earth Science) Which statement about thunderstorms is correct?
A. Lightning is seen before thunder is heard.
B. Thunder can occur without lightning.
C. Thunder is heard before lightning is seen.
D. Lightning and thunder are not related to thunderstorms.

ANSWER KEY:
A. Lightning is seen before thunder is heard.
EXPLANATION:
The result of lightning is a loud booming noise, or thunder. Because sound travels at a much slower speed than light, people see lightning before
they hear thunder.

(Thought this might be helpful for other members via Penn foster online high school) =)