Which colony was created as a military barrier

Why and with what consequences did us relations with asia change between the 1840s and the 1930s?

The strait of magellan connects the atlantic ocean with the a amazon river b. gulf of mexico c. pacific ocean d. caribbean sea select the best answer from the choices provided о а b oo оо

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