The American Sub-Continent refers to North America (including Central America) and South America collectively. It is one of several large landmasses on Earth usually identified as continents.
Plate Tectonics: A theory explaining the structure of the earth's crust involving large-scale movements resulting in features such as rift valleys, mountains etc.
Continental Drift Theory: The hypothesis that states that parts of Earth's crust slowly drift atop a liquid core causing continents' movement over geologic time scales.
Biomes: A community of plants and animals living together in a certain kind of climate.
AP Human Geography - 3.5 Historical Causes of Cultural Diffusion
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