The united states received a significant influx of immigrants from between 2004 and 2010. a. canada b. central america and south america c. western europe d. australia

The correct answer is - B. Central America and South America.

The United States are probably the most desired destination for migrating into in the world, so it constantly has new migrants coming in. From period to period the ethnic and religious composition of the migrants changes, having some groups of people migrate more, while some less, or stagnate in numbers. In the period between 2004 and 2010, it was witnessed a significantly higher number of migrants from Central and South America, mostly from Mexico, Nicaragua, Colombia, and Venezuela. This was due to the safety issues in these countries, as well as the bad economic situations, so naturally people moved towards a place where they can have a better life.

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c. seafloor spreading occurs.

d. crust becomes molten rock.

e. denser plates slide under lighter plates.