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Igneous Rocks

Igneous Rocks. By: Ella Breitenfeldt. What are Igneous rocks?. Igneous rocks form when magma or lava cools. Some of the most common rocks are Igneous. Basalt, a type of Igneous rock, covers most of the ocean floor. Over 700 Igneous rocks have been named. Intrusive or Extrusive?.

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Igneous Rocks

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  1. Igneous Rocks By: Ella Breitenfeldt

  2. What are Igneous rocks? • Igneous rocks form when magma or lava cools. • Some of the most common rocks are Igneous. • Basalt, a type of Igneous rock, covers most of the ocean floor. • Over 700 Igneous rocks have been named.

  3. Intrusive or Extrusive? • Intrusive rock forms under earth’s crust after years of magma slowly cooling. • Extrusive rock forms when lava cools above earth’s surface. • Intrusive rock has time to form crystals; you can see the mineral grains with the bare eye. • Extrusive rock cools instantly and has no time to form large crystals; you’d need a microscope to see the mineral grains. Diorite (intrusive)

  4. Intrusive or Extrusive continued • Intrusive rock is also called plutonic rock. • Extrusive rock is also called volcanic rock. • Intrusive rocks can take up to 100 years to form completely.

  5. Classification • You can classify rocks by the minerals they have within. • An Igneous rock can either be basaltic, granitic, or andesitic. • Basaltic rocks are dense, heavy, dark-colored rocks. • Granitic rocks are light-colored and have less density then balsaltic.

  6. Fun Facts • Most Igneous rocks are plutonic. • Igneous rocks are the oldest type of rock. • Granite, a type of Igneous rock, was used to build the Empire State Building. • Basalt covers most of the ocean floor. • 95% of the top ten miles of the Earth’s crust is Igneous rock. • Only Igneous rocks are formed when lava or magma cools.

  7. Fun activity for home Using this project, you can understand how Igneous rocks are formed. • Materials: -half of a chocolate bar -marshmallow -cooking pot -wax paper -plate

  8. Activity continued • Do It! • Melt the chocolate bar and the marshmallow in the pot. • When heated, pour the mixture onto the wax paper, on the plate. • Put the mixture into the fridge and check the next day. • How did the rock change shape-wise? • What do you think would’ve happened if you tilted the plate?

  9. Thank you! This slide show was made by Ella Breitenfeldt. I hope you had fun!

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