Which of the following groups ruled over much of Central Asia for more than two centuries?

What type of coastline is commonly found along the western side of the america’s

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

Based on what you know about speed of light and sound, which come/comes first in a thunderstorm