Here's a breakdown:
* Metamorphic rocks are formed when existing rocks (igneous, sedimentary, or even other metamorphic rocks) are subjected to intense heat and pressure deep within the Earth's crust or upper mantle. This process changes the rock's mineral composition, texture, and sometimes even its chemical composition.
Here are some examples of metamorphic rocks and the conditions under which they form:
* Marble: Formed from limestone under high pressure and heat.
* Slate: Formed from shale under high pressure.
* Quartzite: Formed from sandstone under high pressure and heat.
* Gneiss: Formed from granite or other igneous rocks under extreme pressure and heat.
It's important to note that while pressure is a key factor in metamorphic rock formation, heat also plays a crucial role.
