Here's a breakdown:

* Weathering: The process of breaking down rocks, soil, and minerals through contact with the Earth's atmosphere, water, and biological organisms. This can be physical (like freezing/thawing), chemical (like acid rain), or biological (like plant roots).

* Erosion: The process of moving weathered material from one place to another. This can be caused by wind, water, ice, or gravity.

So, the dropping off of weathered rock is the result of erosion, where the weathered material has been transported and then deposited somewhere else.

Here are some examples of erosion:

* Wind erosion: Dust storms, sand dunes

* Water erosion: River canyons, coastal erosion

* Ice erosion: Glaciers carving out valleys, ice sheets transporting rocks

* Gravity erosion: Landslides, rockfalls

Let me know if you'd like to learn more about any specific type of erosion!