What is the high concentration of this and the other metals in the mesospthere

Acontinental polar air mass foms in

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

The states that the process that have been occurring today have been occurring since earth formed. what is it?