Igneous Rock

Chapter 2, Section 2: Igneous Rock 1. How does igneous rock form? __________________________________________________________________. 2. The word igneous is derived from a Latin word that means _____________. 3. What two factors affect the type of igneous rock that can be formed? __________________________________________________________________________________________ and ______________________________________________________________________________________. ORGINS OF IGNEOUS ROCK 4. The material that igneous rock forms from is called _____________. 5. What are the three ways magma can form? ___________________________________________________________________________________________ 6. Name and describe the three factors affect the formation of magma. Figure 1 (explain answers to #5) a. _____________________________________________________________________________________ b. _____________________________________________________________________________________ c. _____________________________________________________________________________________ 7. How does the composition of the magma affect the temperature at which it solidifies? _____________________ ___________________________________________________________________________________________ COMPOSITION AND TEXTURE OF IGNEOUS ROCK 8. Explain how density and color relate to one another. ________________________________________________ _______________________________________________________________________________________________ 9. What is a light colored rock called? ______________________________________ 10. The light colored rocks are rich in the elements ___________, ___________, __________, and ___________. 11. _________________ rocks are silica rich which means they are made mostly of silicate minerals. 12. What is a dark colored rock called? ______________________________________ 13. The light colored rocks are rich in the elements ___________, ___________, and ___________. 14. _________________ rocks are silica poor which means they lower proportion of silicate minerals. 15. The longer it takes for a rock to cool and solidify, the more time ______________________ have to grow, giving the rock a(n) __________________________ grain texture. 16. The more quickly an igneous rock cools and solidifies the _____________________________ the grain. 17. Where will igneous rock that has cooled most quickly be found? ______________________________________ IGNEOUS ROCK FORMATIONS Match the correct definition with the correct term. Write the letter in the space provided a. pluton b. dikes c. batholiths 18. _____ rock that forms below the earth’s surface 19. _____ a large, irregular-shaped intrusive body 20. _____ the largest intrusive bodies 21. _____ sheet like intrusions that lie parallel to previous rock units 22. _____ sheet like intrusions that cut across previous rock units 23. Magma ______________________________, or pushes, into surrounding rock below the Earth’s surface to create such formations as batholiths and sills. 24. Intrusive igneous rock usually has a(n) ______________________________ texture. 25. Igneous rock that forms from lava, or magma that erupts onto the Earth’s surface, is called _________________ 26. Lava can either erupt or flow from long cracks in the Earth’s crust called ________________________ 27. When lava flows from fissures on the ocean floor at places where tension is causing the ocean floor to be pulled apart, new ______________________________ is formed. 28. When a large amount of lava forms out of fissures onto land, the lava can cover a large area and form a plain called a(n) ______________________________________.