Author Question: Which factor(s) will most influence the depth of deep-ocean trenches? A) Compressive force B) ... (Read 78 times)

CQXA · **on:** Jul 15, 2018

Which factor(s) will most influence the depth of deep-ocean trenches?

A) Compressive force
B) Rate of convection
C) Density and composition of the mantle beneath
D) Temperature and density of the plate

Question 2

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.