which area on the map has been identified by scientists as having the worst air quality in europe in the early 21st century?
a) 1
b) 2
c) 3
d) 4

The impact of a large asteroid comet with earth has been proposed to have caused the extinction of the dinosaurs. the impact site of this comet is in or near

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

Many feel that the u.s. should not give money to the world bank to aid people in other countries. true or false