Which type of basaltic lava flow has a fairly smooth

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

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.