* Oxidation: This is a chemical weathering process where oxygen reacts with minerals, often with iron, to form oxides. This can happen in dry environments as well as wet ones.

* Frost wedging: This is a mechanical weathering process where water seeps into cracks in rocks, freezes (expanding), and forces the rock apart. This requires the presence of water that freezes and thaws.

* Hydrolysis: This is a chemical weathering process where water reacts with minerals to form new minerals, often clays. This requires the presence of water.

* Solution: This is a chemical weathering process where minerals dissolve in water. This obviously requires the presence of water.

In summary: Oxidation is the only type of weathering listed that doesn't directly require the presence of water.