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| Devils Tower in Devils Tower, WY |
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Devils Tower is a great example of an intrusive igneous rock. Millions of years ago this rock was buried under the ground. This was formed by the cooling of magma. Over the years layers of softer rock fell off or eroded leaving behind the harder igneous rock. |
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| What is igneous rock? | Igneous rocks are called "Fire Rocks" They are the result of either lava or magma cooling | ||
| How are they formed? Two Ways!!! |
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When magma,
or liquid rock under the Earth is allowed to cool; the cooled rock is
called an intrusive igneous rock.
Notice the cooled magma pool to the right. The liquid rock wasn't hot enough to stay a liquid--you get IGNEOUS ROCK ! |
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Check out this short PowerPoint Presentation click on the picture Lava forming into igneous rock Volcanoes National Park, Hawaii
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When lava, or liquid rock on
the surface of the Earth, is allowed to cool; the cooled rock is called
extrusive igneous rock.
The lava flowing down this volcano will travel until the flow from inside this volcano stops. The lava will begin to cool and harden to the side of this volcano. When that liquid rock cools---you get IGNEOUS ROCK ! |
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| Check out this instant igneous rock! |  |
Lava flowing into the ocean cools very quickly. This coastline is made of newly formed igneous rock |
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