How do we know the sun rotates?

a) both sides are red-shifted.
b) because the earth rotates.
c) both sides are blue-shifted.
d) one side is blue-shifted and the other side is red-shifted.

Waianapanapa beach in hawaii is a black-sand beach that was formed by waves crashing against volcanic rock. the sand can be very hot on sunny days. which statement best explains why? o a. the black sand has no heat capacity. b. the black sand absorbs no radiation. o c. the black sand is immune to insolation. d. the black sand has a low albedo.