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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