Weathering is the process that results in the reduction of size and corresponding shape of a body of rock.
The process is called weathering because the changes in the weather break the rocks.
I believe it is physical weathering
deformation
Answering "What process changes igneous rocks into metamorphic types?"Igneous rocks convert into metamorphic due to extreme pressure and heat, which can come from magma/lava or the movement of tectonic plates. For example, the igneous rock basalt eventually turns into the metamorphic rock granulite.
Your question contains part of the answer, 'metamorphic' rocks are the product of this process and the process is called Metamorphism - the solid-state recrystallization of pre-existing rocks as a result of changes in heat, pressure, and/or introduction of fluids.
Stress
all of the forces
The process is called weathering because the changes in the weather break the rocks.
heat and pressure
erosion
Pressure / stress.
Cutting is a physical process.
Subduction and high pressure.
I believe it is physical weathering
The Rock Cycle.
Yes, rocks change in form, shape, size, type, and class through the process of rock cycle.
Deformation