Here's a simple explanation:

* Erosion is the wearing away and transporting of rock, soil, and other materials. Think of it like a river carving a canyon or wind blowing sand across a desert.

* Deposition is the dropping off of eroded material in a new location. This can happen when the forces carrying the material (like water or wind) lose energy. Think of a river dropping sediment at its mouth, forming a delta.

In short:

* Erosion removes material.

* Deposition adds material.

They work together to shape the Earth's surface. Erosion breaks down rocks and moves them, while deposition builds up new landforms.