Definition of Weathering is the decomposition of rocks, soils and their minerals through direct contact with the Earth's atmosphere.
Chemical weathering involves a chemical change in at least some of the minerals within a rock.
Mechanical weathering involves physically breaking rocks into fragments without changing the chemical make-up of the minerals within it. It’s important to keep in mind that weathering is a surface or near-surface process. As we know, metamorphism also produces chemical changes in rocks, but metamorphic chemical changes occur at depth where either the temperature and/or pressure are significantly higher than conditions found on the Earth’s surface.
Definition of Erosion or mass wasting is displacement of solids (soil, mud, rock and other particles) usually by the agents of currents such as, wind, water, or ice
External Causes for weathering are atmospheric conditions like air, pressure etc.
External Causes for erosion are wind, water, ice, humans etc
| Movement of eroded material occurs. |
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Movement of eroded weathered material does not occurs.
In short:
If a particle is loosened, chemically or mechanically, but with no movement, call it weathering. Once the particle starts moving, call it erosion.
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