The united states purchased alaska from russia because a of the large number of oil fields b of the aleutian island c of the gold fields in the yukon d of the fur trading industry

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

Why did the first fleet take the shorter route along the entire west coast of africa?

Name two factors that, "power of magnetic field " of earth.