Which of the following factors was a reason for the "scramble for africa"? the industrial revolution increased the need for natural resources. europeans sought new, warmer vacation destinations. the institution of slavery was made illegal. europe became overcrowded.

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