Rock Cycle, 3 types of rocks + examples

which rock floats

pumice + shale melts to slate

ROCK CYCLE LIST ALL

Sedimentary rock

Sedimentary rocks are formed when pieces of rocks, minerals, and organic matter settle into layers and are pressed together over long periods (examples: shale, limestone)

Igenous rocks

Igneous rocks are formed when molten rock (magma or lava) cools and solidifies. There are two main types based on how they form: intrusive (cooled slowly underground, resulting in large crystals) and extrusive (cooled quickly on the Earth's surface, resulting in small crystals) (granite, basalt).

Metamorphic rocks

Metamorphic rocks are preexisting rocks (like igneous or sedimentary rocks) that have transformed into new, harder rocks due to extreme heat and pressure deep within the Earth (e.g marble, slate).