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Earth's surface and inside the planet slowly change rocks from one kind to another.
Foliation
Wind, rain, heat
It is heat and pressure.
Metamorphism.
If by form you mean the composition and structure, the forces of heat and pressure can lead to metamorphism of a rock from one type into another.
deposition
rocks can change from one type of rock to another, or not change at all
yes it can
constantly
heat and pressure
Sedimentary rocks could become metamorphic rocks if they are exposed to extreme heat and pressure deep in the Earth's crust. The rocks could come to the surface by volcanic activity or rising magma.