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Introduction to Igneous Rocks

Introduction to Igneous Rocks. Audience: 9-12 th Grade Earth Science Class The purpose of this tutorial is to serve as a review of presented concepts involving igneous rocks and igneous rock terms. Objectives: Describe the processes that form the different kinds of igneous rocks.

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Introduction to Igneous Rocks

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  1. Introduction to Igneous Rocks Audience: 9-12th Grade Earth Science Class The purpose of this tutorial is to serve as a review of presented concepts involving igneous rocks and igneous rock terms. Objectives: Describe the processes that form the different kinds of igneous rocks. Explain how crystal sizes of igneous rocks indicates the rate of cooling. Explain how crystal size can also determine whether a rock is intrusive or extrusive. Look for the arrow buttons to move you forward or backward in this tutorial Created by: Kelly L. Taunt

  2. All igneous rocks begin as magma As with other rocks, igneous rocks are classified by their mineral composition and texture.

  3. Igneous Rock Color Felsic: Light colored, formed from magma with a large amount of silica. Intermediate: Not too dark or too light Mafic: Dark colored, formed from magma with a lot of iron and magnesium.

  4. Which building do you think took longer to build? Skyscraper? Playhouse?

  5. So as with the buildings on the previous slide, a large building will take longer to build. Igneous rocks that have a long time to cool will have: LARGE crystals A small playhouse may be built in a small amount of time. So igneous rocks that cool quickly will have: smallcrystals

  6. Practice Quiz ( 2 Slides total): Click the correct answer with your mouse to see if you are correct. Cooled Quickly Try again! Cooled Slowly YES!

  7. Cooled Quickly Correct! Cooled Slowly Try Again

  8. Which person/people will stay warmer longer? Them? Her?

  9. Just like the couple inside next to the fireplace (inside the house), rocks that are IN the Earth stay warmer longer. Igneous rocks that form IN the Earth are called INSTRUSIVE igneous rocks. Inside the Earth.

  10. Just like the girl outside, rocks that are OUTSIDE (exiting the Earth) cool quickly. Igneous rocks that are formed outside of the earth’s surface are EXTRUSIVE igneous rocks. On the Earth’s surface, outside of the Earth.

  11. Since rocks that cool on the outside of the Earth cool faster, extrusive igneous rocks usually have: smallcrystals Rocks that are on the inside of the Earth take longer to cool because they are near a heat source, therefore, intrusive rocks usually have: LARGEcrystals

  12. Can you if this rock is intrusive or extrusive based on crystal size? Intrusive Try Again Extrusive Correct!

  13. Can you if this rock is intrusive or extrusive based on crystal size? Intrusive Correct! Extrusive Try Again

  14. Can you if this rock is intrusive or extrusive based on crystal size? Intrusive Correct! Extrusive Try Again

  15. Are you ready for a quiz? No, I need to review types of magma. No, I need to review crystal size. No, I need to review intrusive and extrusive rocks. Yes, Let’s Go! Click here.

  16. An igneous rocks that forms on the outside of Earth’s crust would be classified as a(n) ________. A. extrusive B. felsic C. intrusive

  17. A mafic igneous rock would be: A. Light colored B. Dark colored C. Intermediate

  18. A rock that has small crystals probably formed in which location? A. Outside of a volcano B. Deep inside a volcano C. Under the Earth’s crust

  19. The rock below would be classified as a(n): ________________ A. Mafic B. Felsic C. Intermediate

  20. The rocks below probably formed ____________, and have __________ crystals. A. Slowly, Large B. Slowly, Small C. Quickly, Small

  21. When an igneous rock has large crystals, it probably formed ____________. A. Quickly B. Intermediate C. Slowly

  22. Intrusive igneous rocks have _______ crystals. A. Small B. Large C. Intermediate

  23. Rocks that form outside of the earth are called what? A. Intrusive B. Extrusive C. Exterior

  24. All igneous rocks originally start as _______. A. Other rocks B. Magma C. Sediments

  25. The rock below represents what type of igneous rock? A. Felsic, Intrusive B. Mafic, Intrusive C. Felsic, Extrusive

  26. The End How did you do? GREAT! Try one more time?

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