Ice wedging, pressure release, plant root growth, and abrasion can all cause mechanical weathering. in the cracks and pores of rocks, the force of its expansion is strong enough to split the rocks apart. ... This release of pressure causes the rock to expand. As the rock expands, cracks form in it, leading to exfoliation.
Answer:
A second mechanism of mechanical weathering is PRESSURE RELEASE. ... The rock body responds by expanding outward once the pressure is low enough, usually once the pluton is completely exposed.
