By high pressure and temperature
Metamorphic rocks originate as igneous and sedimentary rocks, but have been changed by heat and pressure.
Metamorphic rocks are older sedimentary, igneous, and metamorphic changed by pressure and temperature.
Increase the pressure and temperature by burying them; or heat them with an igneous intrusion.
Metamorphic rocks are rocks which have changed from one form to another due to intense heat or pressure. Any rock (sedimentary, metamorphic, and igneous) can be changed into a metamorphic rock.
When igneous rocks and sedimentary rocks are changed due to heat and pressure, they can form metamorphic rocks. This process is known as metamorphism, and it often results in the rocks being altered in texture and mineral composition. Metamorphic rocks can include marble, schist, and gneiss.
igneous, sedimentary, metamorphic
Igneous, metamorphic, and sedimentary rocks can be changed by high temperatures and pressure, and the resultant rock is called metamorphic, because its form has been changed.
Metamorphic rocks can form from both igneous and sedimentary rocks
Metamorphic rocks can form from both igneous and sedimentary rocks
An igneous rock can be metamorphosed (changed) into a metamorphic rock but will no longer be an igneous rock. An igneous body can be intruded into metamorphic rocks but will still be an igneous rock that is different from the surrounding metamorphic rocks. Ethier answer work depending on how the question is read.
Rocks changed by intense pressure and heat become new rocks called metamorphic rocks. These rocks form when existing rocks undergo changes in texture and mineral composition due to high temperatures and pressures. Examples of metamorphic rocks include marble, slate, and gneiss.
Metamorphic rocks are rocks which have changed from one form to another due to intense heat or pressure. Any rock (sedimentary, metamorphic, and igneous) can be changed into a metamorphic rock.