Why did federal troops occupy the South during Reconstruction

How does the concept of competition relate to the arms race between the us and the soviet union during the cold war?

Who is the plaintiff in united states vs lopez

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