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In 1492, about how many distinct languages were probably spoken in North America?
Impermeable Unit
A geological formation or material that does not allow fluids to pass through it.
Surface Water
Water that occurs in streams, rivers, lakes, oceans, and other settings on Earth’s surface.
Groundwater
Moisture trapped below the ground in the soil or within fissures and cavities of rocks.
Cross Section
A diagram or slice that shows the internal structure of a particular object or area, made by cutting or visualizing a cut through the object.
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