Author Question: By what process does the Sun generate energy? A) nuclear fusion B) chemical reactions C) ... (Read 30 times)

savannahhooper · **on:** Jul 27, 2018

By what process does the Sun generate energy?

A) nuclear fusion
B) chemical reactions
C) nuclear fission
D) gravitational contraction
E) gradual expansion

Question 2

While Ganymede and Callisto are about the same size, the surface of Callisto is much younger, with considerable tectonic reformation.

Indicate whether the statement is true or false