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Rocks.

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Presentation on theme: "Rocks."— Presentation transcript:

1 Rocks

2 Categories Igneous Sedimentary Metamorphic Petrifaction

3 How do you think rocks form?

4 Sedimentary Rocks Formed when layers of sediment are pressed together. Pressure and heat cement the layers into solid rocks.

5

6 Igneous Rocks Formed when molten or liquid matter from inside Earth comes to the surface, cools, and hardens.

7 Metamorphic Rocks Formed when heat and pressure over long periods of time work to fuse together other kinds of rock.

8

9 Petrified Rock Rock formed when plant or animal remains are replaced with minerals and chemicals.


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