A model of the rock cycle should illustrate the process that changes sedimentary rock into metamorphic rock as metamorphism. This process involves subjecting sedimentary rocks to high temperatures and pressures over long periods of time, causing physical and chemical changes.
In the rock cycle diagram, you would typically see arrows indicating:
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Heat and Pressure: This represents the environmental conditions under which metamorphism occurs, such as being buried deep within the Earth or being located near tectonic plate boundaries.
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Transformation: This indicates the transition from sedimentary rock to metamorphic rock, highlighting that the original rock is altered into a new type of rock, often with different mineral compositions and textures.
So, in summary, the transformation from sedimentary rock to metamorphic rock in the rock cycle is represented by the process of metamorphism under heat and pressure.