what is erosion? How is it different from weathering?

Answer 1

Weathering is the breakdown of rocks and minerals at or near the earth's surface by physical and chemical processes such as temperature differences, air, and water under conditions different from the environment of rock and mineral formation. Erosion is weathering combined with the transportation of the weathered material.

So the difference is the movement or transport inherent in erosion - by glaciers, gravity, wind, water, etc.

Answer 2

Weathering is the process that breaks down rock and other substances at Earth's surface. The forces of weathering break rocks into smaller and smaller pieces through either mechanical or chemical changes. Then the force of erosion carries away the pieces. Erosion is the movement of rock particles by wind, water, ice or gravity. Weathering and erosion work together continuously to wear down and carry away the rocks at Earth's surface.