Article on Igneous Rock

http://www.sciencedaily.com/articles/i/igneous_rock.htm

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What is the rock Cycle Exactly?

The main idea is that rocks are continually changing from one type to another and back again.  Forces inside the earth bring them closer to the surface where they are weathered, eroded, and compacted, and forces on the earth sink them back down where they are heated, pressed, and melted. So the elements that make up rocks are never created or destroyed instead, they are constantly being recycled. 

The Three Main Types of Rocks

Igneous rocks form in two very different environments. All igneous rocks start out as melted rock, which is called magma, and then it crystallize or freeze. 

Metamorphic Rocks form when sedimentary, igneous, or other metamorphic rocks are subjected to heat and pressure from burial or contact with intrusive or extrusive igneous rocks.   In case you didn't know, "Meta" means change and "Morph" means form.

Sedimentary rocks are those rocks made up of pieces of other rocks.

Identify Each Class of Rock

Gneiss

Marble

 Basalt

Limestone

Conglomerate

Obsidian

Cool Rock Cycle Song!