THE PROBLEM: How did the landforms of the NYC region originate?
THE HYPOTHESIS: Many geologic processes result in the deposition of loose, rocky materials. Deposition raises the elevation of the land. At the end of a series of depositional events, the final elevation of the land in a given place depends upon the initial elevation plus the thickness of deposited materials.
In some cases, an entire area of hills and valleys may be deeply buried by regional deposition to form a new, flat surface (a plain) at a higher elevation.
In other cases, deposition is uneven, some areas receiving more deposits than others ('differential deposition'). Differential deposition may result in an uneven land surface characterized by hills and valleys.
One or more of the major landforms in the NYC region are due to deposition.
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