These whole crayons represent igneous rocks.
These crayon shavings represent sediment created after igneous rock is weathered or eroded.
This is sedimentary rock formed by sediment being compressed together at the bottoms of lakes, creeks, or oceans.
This is metamorphic rock created from sedimentary rock being under extreme pressure or temperature changes under the crust of the Earth. This change takes thousands and thousands of years.
Extreme heat melts the metamorphic rock back into lava or magma.
When the magma / lava cools, igneous rock is created again.