Explanation:

1, 2 and 3

Explanation:
Mechanical weathering involves the physical breakdown of rocks without changing their chemical composition. Forces contributing to this include:

• Gravitational force (e.g., rockfalls, landslides)

• Expansion force (e.g., due to temperature changes causing thermal expansion)

• Water pressure (e.g., freeze-thaw cycles where water enters cracks, freezes, and expands)

All three listed forces play a role in mechanical weathering.