What is weathering in geography?

weathering is not the same as eroding!!! but it is when something brakes down or gets smaller naturally (preferably rocks).

Physical weather:

you can have: freeze thaw which is when water gets into a crack, freezes over night (when water freeze it expands) pushes the crack open a bit more, then more water comes in a this keeps happening until it cracks in 1/2.

Physical Weathering:

onion skin weathering usually happens is the dessert: the rock get so hot in the day and expands, then quickly gets freezing cold at night and contract (after many night of this happening, it sheds the outer layer, like an onion skin, and this keep happening). Warning: this happens after a very very long period of time.

Chemical Weathering:

chemical weathering is when acid rain or chemical in the river etc react with mineral in rocks (( usually in sedimentary rocks)).

Biological Weathering:

this is when roots of plants grow into rock cracks, prizing open the cracks more and more. it is also when small animal burrow into cracks etc.

there are more types but these are the major ones! hope this helps :)