Earth Science Rocks!!

How Igneous Rock Is Formed

They are formed by the crystallization of magma or lava

Igneous rocks may form deep inside the Earth or at the Earth’s surface when a volcano erupts.

Intrusive Rocks

GRANITEGRANITE is a coarse to medium-grained rock that forms from the cooling of magma deep within the

Earth.

Extrusive Rocks

Ryolite is an Ryolite is an example of an example of an igneous rock igneous rock that cooled that cooled quickly at the quickly at the surface.surface.

Obsidian

Pumice

How Sedimentary Rock Is Formed

• These rocks are formed when sediment grains are compacted and cemented together.

Types of Sediment

*Check out sedimentator…What do you see?*

• Silt, Clay, Sand, Gravel, Pebbles

• Plant Material

• Shell Pieces

Sandstone

Shale

                                                            

BY CRYSTALLISATION FROM DISSOLVED MINERALS

                                                                                                                     

Sedimentary Rock Formed by ….

Forms salt

Salt Flats in Utah

Organic Sediments

Coal – forms from decayed plant remains.

Coquina – This rock is created from shells.

Chalk- Limestone Rock

White Cliffs in Dover, England

Limestone is also made from the remains of coral.

• Metamorphism is the process of changing one rock to another through heat, pressure, and chemical change.

•Forms deep in the earth’s crust

Metamorphic Rocks

Contact Metamorphism-

Types of Metamorphism

Regional Metamorphism

Heat and Pressure

Shale (Sedimentary Rock) Slate (Metamorphic Rock)

Sandstone (Sedimentary Rock) Quartzite (Metamorphic Rock)

Limestone (Sedimentary Rock)

Marble (Metamorphic Rock)

Heat and Pressure

METAMORPHICMETAMORPHIC SEDIMENTARYSEDIMENTARY

IGNEOUSIGNEOUS

mel

ting

heat

, pre

ssur

e,

ions

weathering, transportation

lithification

melting

weathering, transportation, lithification

heat, pressure, ions

The Rock Cycle