Where are earthquakes most likely to occur? A. Where Earth’s tectonic plates are sliding past each other.
B. Where magma cools slowly beneath Earth’s surface.
C. Where Earth’s lithosphere is in constant, slow motion.
D. Where Earth’s seafloor is spreading into deep ocean trenches

Some gamma ray bursts are hypothesized to come from mergers of neutron stars or black holes. if this hypothesis is correct, what else should we in principle be able to detect from such mergers? a. gravitiational waves b. x-ray bursts c. significant disruption of gas thousands of light-years away in the surrounding galaxy d. an "afterglow" of bright visible light, lasting for weeks