What is the outermost layer i earth called?

Identifica pe harta vulcanii catopaxi si llullaillaco analizeaza semnele conventionale si indica tipul acestor vulcani

Which of the following best describes the economy of africa?

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