PLESE HELP SEMESTER EXAM QUESTIONS! One of the natural features that separates the Great Plains from the Coastal Plains is the: a)Balcones Escarpment
b)Pecos River
c)Sabine River
d)Chisos Mountains

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