If a drop of water lands in western Colorado in what river will it end up?

From 1990 to 2008, by what percent did the world’s most developed economies cut their greenhouse gas emissions?

Marine exptoration of oil uses seismic waves to locate oil in the seabed. what is a negative impact from seismic waves on the aquatic ecosystem of the ocean? a.seismic waves kill microoganisms b.seismic waves disrupts the sand and causes seafloor erosion c.seismic waves have virtually no adverse affects on marine life d.seismic waves damage the sonar that dolphins and whales use to orient themselves underwater

Between 1870 and 1916, approximately how many immigrants came to the united states? 10 million 25 million 75 million 125 million