2. Sedimentary Rocks
• Made up of smaller rocks cemented
together
• Sometimes have fossils
• Usually have layers.
3. 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.
6. 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)
7. 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.
11. 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)
12. 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.
16. 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?
17. 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.
