The bottom layer of the atmosphere is called what

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 teh following would explain the importance of the trans-siberian railroad to russia's economy? (schoology test)

Formidable obstacles of climate, terrain, and distance hinder exploitation of natural resources in russia. true false