Here's a breakdown:
* Igneous rock forms from the cooling and solidification of magma or lava.
* Sedimentary rock forms from the accumulation and cementation of sediments.
* Metamorphic rock forms when existing igneous, sedimentary, or even other metamorphic rocks are subjected to intense heat and pressure deep within the Earth's crust. This transformation changes the rock's mineral composition, texture, and sometimes even its chemical composition.
Examples of metamorphic rocks include marble (from limestone), slate (from shale), and gneiss (from granite).
