THE HYPOTHESIS: One or more of the major landforms of the NY City Area formed due to the more rapid wearing away of areas underlain by non-resistant materials and less rapid wearing away of areas underlain by resistant materials.
One or more of the areas that have higher elevations should be found to be underlain by more resistant material than adjacent areas with lower elevations.
EVALUATING THE PREDICTION: Elevation data may now be compared to the Erosion Resistance Index to evaluate the prediction.
It will be simplest to make the comparison in two stages. It will be simplest because:
- The topography and geology of Manhattan, the Bronx and Adjacent New Jersey have been mapped separately from that of Brooklyn and Queens.
- In Manhattan, the Bronx and adjacent NJ, bedrock (the firm, continuous rock mass that underlies soil or loose sediment) is at or close to the surface. In Brooklyn and Queens, bedrock is buried by various types of loose sediment.