Why did the north opposes slavery in 1820

Why does benjamin martin eventually join the continental army

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

Which economic sector employs the least number of people in mexico, barbados, and venezuela? a. agriculture b. services c. industry