What is the geographical significance of the russian plain? . . a. the russian plain is the most populated region of russia. b. the russian plain contains the highest point above sea level in russia. c. the russian plain is the largest mountain-free area of russia. d. the russian plain has the coldest temperatures in russia.

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

Which of these is most likely a characteristic of a non-radioactive daughter isotope after it is form from the parent isotope ? a. stable electrons b. stable nucleus c. positively charged atom d. negatively charged ion

What change took place in china's southwest region after the communists came to power? a) encouraged by government policies, the economic base of the region changed from agriculture to nòmadic herding. b) the communist government established a special economic zone in the region. c) the leader of the religion practiced in the region went into exile, d) the leader of the religion practiced in the region was executed.