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a very dense layer at the center of the earth, rich in nickel and iron, which is thought to be solid
theory of plate tectonics
theory of plates meeting at boundaries, which differ based on the direction of the plates' movements at these boundaries
Geographic Information Systems (GIS)
A new technology many scientists use to visualize landforms and other landscape information
the process of moving loosened rock or soil away from where it was formed by wind, water, or gravity and depositing it elsewhere
large bodies of ice carve out valleys and erode mountains as they move slowly outward or downhill
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