The correct answer is D. Choice A is incorrect because all galaxies are moving away from Earth. Choice B is incorrect because the big bang theory does not refer to a sound. Choice C is incorrect because light is refracted in black holes, although it has been found to be refracted the "wrong way."

A is the correct answer. Weight depends on the gravitational attraction between two bodies in space and the more massive the planet, the more you weigh.

The correct answer is A. The magnetic field of Earth and the behavior of seismic waves are the two biggest bits of evidence for our current model of the Earth's core. We do not have the technology or resources to drill a hole deep enough and our comaprisons to the other planets are only rudimentary at present. Moreover, the speed of the Earth's rotation has very little to do with the constituents of the core.

C is the correct answer. Sonic booms and sink holes have nothing to do with earthquakes. Tsunamis can be caused by an earthquake and earthquakes are frequent in areas of high volcanic activity, but they are caused by the dynamic release of elastic strain between plates.