Answer:
great lakes
Explanation:
Water from the melting glacier filled the basins , forming the Great Lakes.
They began to form by a combination of volcanic activity and the deposit of marine sediments. It formed along northwest Africa about 530 million years ago. ... As the Appalachian Mountains eroded, sand and clay were deposited over Florida's limestone layer.
One reason that rock layers are not horizontal are because of erosion and it also depends we’re you find the rock layer
