Which of the following is NOT a landform created by a force of erosion? Canyons
Sand Dunes
Ridges
Valleys

Witch of the following volcano hazards is made up of rocky particles about the size of a grain of sand

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

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