What event was the catalyst for the secession of the first seven southern states in 1861

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

Who led the continental army in the final decisive battle of the revolutionary war at yorktown

Ahistorian claims massive drought and famine in china caused the boxer rebellion. which of the following historians is making a counterclaim?