* Metamorphic rocks form from existing rocks. They can be formed from:

* Sedimentary rocks: Heat and pressure can transform sandstone into quartzite, limestone into marble, and shale into slate.

* Igneous rocks: Granite can be transformed into gneiss, basalt into amphibolite, and gabbro into eclogite.

* Other metamorphic rocks: Existing metamorphic rocks can be further metamorphosed into different types.

* Metamorphic rocks do not directly form igneous rocks. Igneous rocks are formed from the cooling and solidification of magma (molten rock) or lava (molten rock that has erupted onto the surface).

The Rock Cycle:

The rock cycle describes how rocks transform over time:

1. Igneous rocks form from molten rock.

2. Sedimentary rocks form from the weathering and erosion of existing rocks, which are then transported and deposited, then cemented and compacted.

3. Metamorphic rocks form when existing igneous, sedimentary, or even other metamorphic rocks are subjected to heat and pressure.

It's important to understand that these transformations can occur in a cycle. A sedimentary rock can be metamorphosed, and then the resulting metamorphic rock can be melted to form a new igneous rock.