What causes the formation of trenches in earth’s crust?

Trenches are formed by subsection, a geophysical process in which two or more of Earth's tectonic plates converge and the older, denser plate is pushed beneath the lighter plate and deep into the mantle, causing the seafloor and outermost crust (the lithosphere) to bend and form a steep, V-shaped depression.

Explanation:

not too sure but maybe in the hot springs.