If rocks are pushed deeper into the Earth and experience greater heat and pressure without melting, they will turn into metamorphic rocks.

Here's why:

* Metamorphism: This process involves the transformation of existing rocks (igneous, sedimentary, or even other metamorphic rocks) due to changes in temperature, pressure, and/or chemical environment.

* No Melting: If the rock doesn't melt, it remains solid. However, the extreme conditions cause the rock's minerals to recrystallize, resulting in a new texture and sometimes even new mineral composition.

* Examples: Common examples of metamorphic rocks include marble (from limestone), slate (from shale), and gneiss (from granite).

Let me know if you'd like to learn more about specific types of metamorphic rocks!