The danger of reduced traction is greatest: a. within the first half hour of rainfall. b. within the first hour of rainfall. c. within the first two hours of rainfall. d. the first day it rains after a drought.

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