Erosion is the process where the earths surface is broken down, transported and deposits elsewhere. It usually done by wind, rivers, ice and the sea.

Weathering is the breaking down of the Earth’s surface  in situ, or “with no movement”.
Two important classifications of weathering processes exist — physical and chemical weathering. Mechanical orphysical weathering involves the breakdown of rocks and soils through direct contact with atmospheric conditions, such as heat, water, ice and pressure. The second classification, chemical weathering, involves the direct effect of atmospheric chemicals or biologically produced chemicals (also known as biological weathering) in the breakdown of rocks, soils and minerals.