types of rocks
Post on 16-May-2015
7.516 Views
Preview:
DESCRIPTION
TRANSCRIPT
Types of Rocks
Sedimentary, Igneous, Metamorphic
Sedimentary Rocks
• Made up of smaller rocks cemented together
• Sometimes have fossils• Usually have layers.
Sedimentary Rocks
• Form when loose sediment (rocks, sand) is deposited by water, compacted, and cemented together.
• Form as a chemical reaction in the water that leaves a chemical deposit, usually on an ocean bottom.
• Form along beaches, by rivers, or under the water in lake or oceans.
Sedimentary Rocks
Examples of Sedimentary Rocks
Igneous Rocks
• Some were once liquid magma that erupted from volcanoes. They cooled very quickly. (Extrusive)
• Others were once liquid magma, but they did not erupt from volcanoes. Instead, they cooled slowly underground. (Intrusive)
Igneous Rocks
• Extrusive:– Rocks that are from cooled lava (above
ground.– They cooled very quickly, therefore formed
small crystals
• Intrusive– Rocks that are from cooled magma (below
ground)– They cooled very slowly, therefore formed
large crystals.
Igneous Rocks
• Which is extrusive and which is intrusive?
Extrusive
Intrusive
Igneous Rocks
Examples of Igneous Rock
Metamorphic
• Form when igneous, sedimentary, or other metamorphic rocks are heated and/or squished, forming a new rock type.
• Usually has interlocking crystals and layers (called foliation)
Metamorphic
• This can either happen underground or above ground.– Underground: high pressure and heat– Above ground: volcano erupting
• When classifying metamorphic rocks, they always come from a parent rock.
Metamorphic Rocks
Examples of Metamorphic Rocks
Review
• What are the three rock types?• What are sedimentary rocks?• What are igneous rocks?• What are the two types of igneous
rocks?• What are metamorphic rocks?
Copyright Information
• All information was retrieved from research done on the internet in February 2007.
• All pictures were retrieved from a Yahoo image search in February 2007.
top related