What occurs when two pieces of land change their vertical relationship to each other?
a. dip-slip
c. tipping
b. strike-slip
d. subduction

Arid and semiarid subcategories are part of which climate

Distance that the transcontinental railroad covered from omaha to san francisco.

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