Sediments proceeding from pre-existent rocks get deposited in layers, and by their own weight, temperature, and pressure action, a new wavy and distorted pattern of metamorphic rocks is produced.
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Temperature, pressure, and sediments are the factors influencing metamorphic rocks' formation.
Metamorphic rocks result from the pre-existent rocks' transformation, in their solid-state, after being subjected to changes in temperature and pressure conditions and tectonic efforts.
Metamorphic rocks originate from the weight of the conforming materials, their densities, and their deepness. These materials are grains (from sedimentary rocks) or chrystals (igneous and other metamorphic rocks) that break.
When the temperature increases, the minerals stop being stable, and chemical elements create new associations that depend on temperature and pressure exposure. Fusion occurs, and metamorphic rocks are created.
Sediment deposition in layers and the weight of material creates lithostatic pressure in the interior of the crust. Pressure generates alignment of materials (foliation and schistosity) and mineral rotation, producing a wavy and distorted pattern.
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