* Mechanical Force: Tree roots grow and expand, exerting pressure on the surrounding rock. This pressure, focused along natural joints (existing cracks or fissures) in the granite, forces the rock apart.
* Physical Expansion: As the roots grow thicker, they wedge themselves into the joints, widening them over time.
* Root Growth: The primary force driving this wedging is the relentless growth of the roots, a biological process.
While there may be some minor chemical processes involved, they are not the primary drivers:
* Root Acids: Some tree roots release weak acids that can slightly dissolve the granite, but this effect is usually minimal compared to the mechanical force of wedging.
* Weathering: The granite itself may undergo some weathering due to exposure to the elements, which can make it more susceptible to root penetration.
Therefore, the wedging of tree roots in granite is predominantly a mechanical process driven by the physical expansion and growth of the roots, exploiting existing weaknesses in the rock.
