What made Obama an unconventional president?

Ahill is made of rock particles of different sizes. which of these agents of erosion probably caused the hill to form?

One of the main reasons the united states occupied japan after world war ii was that

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