Geographical features on plate boundaries?

Question

can u help me? what is the Geographical features on plate boundaries movement. mY rock is stack but it use to be a arch

Answer 1

Well, if I assume that all of your information is part of the same answer, I would say that you are talking about a sea stack.

A sea stack is a piece of rock that was once connected to an island or continent. Ocean waves wear against the rock until a sea cave is formed. They continue to wear at the back of the cave until they break through the rock, forming an arch. While ocean waves continue to wear against the remaining rock, the top of the arch falls in, leaving a sea stack that is no longer attached.

Here's my beef about that being the answer: sea stacks are about erosion, not plate tectonics. Sure, they form at the boundary of dry land and ocean, but they are usually very firmly on the continental plate. The plate boundary is usually some distance out to sea.

When I think of geographical feaures on plate boundaries, I think of a) oceanic trenches and b) vocanic arcs, and c) other mountains that result from uplift, when one plate subducts under another.