The Rock Cycle

Rocks that form when sediments are compacted and cemented together. Sedimentary Rocks that form when sediments are compacted and cemented together.

Sedimentary The sediments come from weathering and erosion of igneous, metamorphic, or other sedimentary rock.

cementing grains of sand Sandstone Description Formation dull grainy cementing grains of sand

Most are consolidation of skeletons of marine invertebrates Limestone Description Formation Dull Fine to coarse grain Most are consolidation of skeletons of marine invertebrates

Consolidation of mud or clay Shale Description Formation Dull Splits into layers Consolidation of mud or clay

Metamorphic Rock that forms when the texture and composition of a pre-existing rock is changed by heat or pressure deep underground.

Metamorphic Igneous and sedimentary rock can change into metamorphic rock, and metamorphic rock can change into other metamorphic rock.

hard, made of glassy grains metamorphism of limestone Marble Description Formation hard, made of glassy grains metamorphism of limestone

Hard, sparkly grains, dense metamorphism of sandstone Quartzite Description Formation Hard, sparkly grains, dense metamorphism of sandstone

Slate Description Formation Splits into layers metamorphism of shale

Igneous Forms from the cooling of magma. When magma cools and solidifies, it forms igneous rock

Granite Description Formation coarse grain with clear glassy minerals formed from magma

Smooth with possible air bubbles, light Basalt Description Formation Smooth with possible air bubbles, light Volcanic rock formed by rapid cooling of melted peridotite

Glassy, smooth sharp edges Felsic lava cooled rapidly Obsidian Description Formation Glassy, smooth sharp edges Felsic lava cooled rapidly

90% porous, light, full of air pockets Pumice Usually dark colored 90% porous, light, full of air pockets Formed when material is ejected into the air as froth