How did the volcanoes in the ring of fire form?
a) one of earth’s plates was forced under another plate.
b) lava built up after it flowed slowly from a volcano's cone.
c) earth's plates separated and pulled apart from one another.
d) a hot spot burned a hole through a thin spot in earth's crust.

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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

Select the natural regions. delta denver forest georgia north america plateau stream