Metamorphic rocks are shaped under the surface of the earth from intense heat and pressure. The rocks that result often have ribbon-like layers and may have shiny crystals. We used bread to make metamorphic rocks. The three types of bread represented our minerals. We used the heat from our hands to begin the process and then we stood on the bread balls (rocks) to apply extreme pressure.
We began by combining the minerals (represented by different types of bread) into a sedimentary rock.
We applied extreme pressure.
We have our metamorphic rocks! Notice how the “minerals” combined in different ways.