Acid rain is caused by humans impacting which cycle? A. water cycle
B. carbon cycle
C. nitrogen cycle
D. none of the above

In the diagram below dab and dac are adjacent angles

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

Irelanda. populationb. square mileagec. average population density per square mile