Deltas a. are made of sediment deposited near the mouth of a stream. b. form where a stream deposits sediment on a flat plain at the base of a mountain range. c. contain distributaries that flow into the trunk river. d. may sink below sea level if the river and its distributaries frequently flood the delta.

Which statement describes john tuzo wilson’s contribution to the theory of plate tectonics? he proposed that plates carry parts of the seafloor. he theorized that pieces of earth move for a limited time. he suggested that the asthenosphere is broken into segments. he observed seafloor cracks similar to existing cracks in the continents.