What are several processes involving expansion and contraction that can contribute to rock weathering?

Frost wedging: When water seeps into cracks in rocks, freezes, and expands, causing the rock to break apart. Root wedging: Plant roots growing in cracks can exert pressure as they expand, breaking the rock apart. Thermal expansion: Rocks expand and contract due to temperature changes, leading to weathering over time. Salt crystal growth: Salt crystals forming in the pores of rocks can expand, exerting pressure and breaking the rocks apart.