Metamorphic rocks don't directly turn into another type of rock. Instead, they are part of a continuous cycle called the rock cycle, where rocks transform into different types through various processes.

Here's how a metamorphic rock can change:

1. Weathering and Erosion:

- Metamorphic rocks, exposed to the surface, break down due to weathering (wind, rain, ice, etc.) and erosion (transporting the broken pieces). This creates sediments.

2. Sedimentation and Lithification:

- The sediments are transported and deposited, often in layers. Over time, these layers are compacted and cemented together, forming sedimentary rocks.

3. Melting and Crystallization:

- If the sedimentary rocks are buried deep enough and exposed to intense heat and pressure, they can melt into magma. As magma cools and solidifies, it forms igneous rocks.

4. Metamorphism:

- Both sedimentary and igneous rocks can be subjected to heat and pressure, causing them to change their mineral composition and texture. This is the process of metamorphism.

5. Back to the Beginning:

- Metamorphic rocks can then be weathered and eroded, starting the cycle again.

So, in summary:

* Metamorphic rocks don't directly transform into another type of rock.

* They can be broken down into sediments, which form sedimentary rocks.

* They can also melt and solidify, forming igneous rocks.

* Metamorphism itself is a process that changes existing rocks, not creates new ones.

The rock cycle is a continuous loop where rocks transform, with each process influenced by factors like heat, pressure, weathering, and erosion.