Weathering
Epicenter
Compressive stress causes the "crumpling" and folding of rock layers.
The force that causes warm molten rock to move upward to the mantle is called convection. Convection happens when parts of the tectonic plate break off and melt.
Chemical weathering
Deformation is a change in the shape and volume of a rock, deformation is produced when a rock experiences a stress that is greater than the strength of the rock.
An increase in heat or pressure could cause further metamorphism.
Heat, pressure, weather, gravity, plate tectonics--all play a part in the rock cycle.
Mechanical weathering occurs when an applied force causes rock to break.
the force that acts on rock to change its shape or volume is stress.
The application of heat and / or pressure causes a rock to be transformed into a metamorphic rock.
Pressure and/or Heat act on a rock to change it
The stress force that causes a mass of rock to pull or twist in opposite directions is called tension. Shearing is the stress force that causes a mass of rock to pull or twist in opposite directions.
Compressive stress causes the "crumpling" and folding of rock layers.
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.
from what i know there is no physical change that signals the end of metamorphism but there is a physical change during the process of metamorphism. during metamorphism the shape of the rock changes due to force of stress this is a physical change. (a physical change is when the shape or composition ofa substance e.g. rock has changed). by the way i am only 12
The forces that causes rock layers to move are; 1. Tensional Force. 2. Compressional Force. 3. Quiescent Force.
Mechanical change
Gravity