The Cascadia subduction zone off the coast of Washington and Oregon famously lacks a well-defined deep-ocean trench. Why might this be the case?
A) Compression from the convergent boundary has squeezed any potential trench closed.
B) There is a massive amount of sediment fill from the Columbia River basin.
C) The descending plate is warm and buoyant, so it subducts shallowly.
D) There is a shallow angle of plate subduction, as well as large quantities of sediment infill.
Answer: D
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