Explanation:

- Mid-ocean ridge:

- These are created at divergent plate boundaries, where two tectonic plates move apart.

- New ocean floor is created as magma rises to fill the gap.

- Land erosion:

- This is a process where soil and rock are removed from the Earth's surface.

- It’s caused by water, wind, or ice, not related to tectonic plate collisions.

- Oceanic trench:

- These form at convergent plate boundaries, specifically when an oceanic plate subducts under another plate.

- They are deep underwater valleys.

- Mountain building:

- Occurs at convergent plate boundaries when continental plates collide.

- The collision causes the crust to crumple and fold, forming mountains.