Which event causes the formation of trenches in Earth's crust? magma rising
mantle emerling
volcanoes erupting
lithosphere colliding

Litosphere coliding

Explanation:

Trenches are formed by subduction, 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.