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Tectonic estuaries are created by tectonic activity, the process of the Earth's crust rifting apart and shifting together. The San Francisco Bay is a tectonic estuary surrounded by faults, illustrated by red lines on this map. The complex tectonic activity of the area results in downwarping, the process of an area of the Earth sinking to a lower elevation. The Pacific Ocean filled in the downwarped valley southwest of the mouths of the San Joaquin and Sacramento Rivers, visible in the upper right of the image.
Not Rated Yet.