Question

Which statements explain what happens at deep-ocean trenches? Check all that apply.

Crust is formed.
Mountains are formed.
Seafloor spreading occurs.
Crust becomes molten rock.
Denser plates slide under lighter plates.

Answer 1

the answers are the first and last option

Answer 2

Options (4) and (5)

Step-by-step explanation:

The deep oceanic trench is an important geological feature that is formed in a convergent plate boundary. It is a V-shaped depression that forms due to the subducting of the denser plate below the less dense one. As the heavier plate goes down it starts melting, and the melt mixes with the uprising magma. This is how the crustal hard rocks change into hot and molten rocks. These magmas then rise upward forming convection currents. This convergent boundaries forming deep oceanic trenches are responsible for the generation of deep-focus earthquakes.

Thus, the correct answers are options (4) and (5).