Question

what causes lightning?
a. buildup of sound energy in a cloud
b. buildup of charge in a cloud
c. buildup of pressure in a cloud
d. buildup of light in a cloud

Explanation:

Lightning is caused by the buildup of electrical charge in a cloud. When the charge difference becomes large enough, a discharge (lightning) occurs. Sound energy (A) is related to thunder (which follows lightning), pressure (C) and light (D) buildups are not the cause of lightning.

Answer:

B. Buildup of charge in a cloud