Which statement about the Yellowstone Caldera is true? A. The Yellowstone Caldera is the only caldera in the park resulting from a meteorite strike. B. The Yellowstone Caldera drags the hot spot with it when the plate beneath the caldera moves. C. The Yellowstone Caldera will eventually move farther away from the hot spot source. D. All the calderas in the park, including the Yellowstone caldera, formed at the same time.

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.