By: Kevin Choi

The Rock Cycle

The rock cycle is the never ending cycle of rocks being formed out of other rocks. The steps are: (not in order) magma, igneous, sediments, sedimentary, metamorphic.

My 3 Rocks


Obsidian is an extrusive igneous rock. It is found all over the world. It is created by rapid cooling magma/lava (can be made under crust). Fun Fact: obsidian always breaks with a sharp edge.


Sandstone is a sedimentary rock. It is basically found wherever there is sand. It is created by the compression of sand and other sediments. Fun Fact: petroleum and natural gas are often found in sandstone.


Marble is a metamorphic rock. It can be found in mountainous areas all over the world. It is created after rocks and/or minerals (usually limestone or dolomite) crystalize. Fun Fact: Ground marble is used in products such as some papers and paints and in toothpaste.