What are the causes of water scarcity in tanzania?

What benefits does this type of farming have?

The ozone hole is at its biggest each year in the ? hemisphere in the ? season.

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