By- Mason McSpadden
Magma starts the rock cycle. Magma is a complex high-temperature fluid substance. Temperatures of most magmas are in the range of 1300 °F to 2400 °F. Magma is soon cooled and crystallized into igneous rocks.
Metamorphic rocks are the oldest rocks. They are formed two ways. The first way is sedimentary rocks being heated and put under pressure. The second way is Igneous rocks being heated and put under pressure. Metamorphic rocks can be melted into magma. Then the rock cycle starts over again.