What are the Galapagos shark's class and reproduction?

If forces acting on an object are unbalanced, which factors may result fron an unbalanced force? check all that apply

Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.

Convection currents are caused by differences in what two things?