Arock's exposure to the weathering elements and its surface area can affect its rate of weathering. rocks that are constantly bombarded by running water, wind, and other erosion agents, will weather more quickly. rocks that have a large surface area exposed to these agents will also weather more quickly.

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