Which of the following is true of high clouds? a. they generally produce lightning. b. they are a sign of severe weather. c. they are composed of ice crystals. d. they cause most precipitation.

C. The highest clouds are composed of ice crystals.

C. They are composed of ice crystals.

Cause of he different elevations  hope this ?

Geothermic gradient is the rate of increasing temperature with respect to increasing the depth in the earths interior. away from tech tonic plates boundaries, it is about 25-40 c/km (72-87 degrees f/mi) of depth near the surface in most of the world.