Which of the following is the point underground where rock layers first move during an earthquake? epicenter focus fault crosspoint

What group addressed the issue of slavery in the election of 1848 by opposing slavery in new territiories

What is associated with mid-ocean ridges?

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