The existence of an area of free land, its continuous recession, and the advance of American settlement, explain American development.
•explain the quotes significance?

What cultural factors do geographers consider when they study human geography? climate patterns customs elevations ethnicity language religion

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

Brainliesttt !me : ) describe the responses to terrorism in the united states.