ROCKS
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
Igneous Rock
Sandstone
Sedimentary Rock
Marble
Metamorphic Rock
Obsidian
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
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
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.