wether
Physical is when a rock or something changes its shape and not structure. Chemical is when a rock or something changes its entire format like a shape and structure.
The process by which the shape of a rock changes in response to stress is called deformation. This can result in folding, faulting, or fracturing of the rock.
Shape of rock also changes because of stress. It causes the rock to change its shape. When a lot of pressure applies it causes the rock to change its shape.
Stress
pressure
deformation
All changes in the original shape and size of a rock body are called deformation. This includes processes like folding, faulting, and shearing that can alter the appearance and structure of a rock.
The force that changes a rock's shape or volume is called stress. This can occur due to factors such as compression, tension, or shear forces acting on the rock.
pressurization (and plenty of time)
This is technically known as strain. If the change in shape occurs by fractures forming through the rock this is known as a brittle deformation. If however the rock deforms like a piece of clay being squashed this is known as ductile deformation.
When a solid rock deforms and then returns to its original shape, it is known as elastic deformation. The rock doesn't break under pressure, but instead changes its form, and after the pressure is released the rock goes back to its shape.
Probably weathering and/or erosion.