1. What is another name for Intrusive? Plutonic

2. What is another name for Extrusive? Volcanic

3. What is the E.O.F. of a very coarse rock? Intrusive

4. What is the E.O.F. of Pumice? Extrusive

5. What is the E.O.F if the rock is Vesicular? Extrusive

6. Which is the only rock on your charts with grain size 10 mm or larger
Which is the only rock on your charts with grain size 10 mm or larger? Pegamatite

7. What is the grain size of obsidian? Noncrystalline

8. What is the grain size of Basalt? Less than 1 mm

9. Which coarse grained rock is felsic? Granite

10. What is the term for rock with two textures? Porphyry or Porphyritic

11. A Felsic rock has what two elements for its composition
A Felsic rock has what two elements for its composition? Silicon and Aluminum

12. What two elements does a Mafic rock contain? Iron and magnesium

13. A dark colored rock generally has a what composition? Mafic

14. What is the composition of Andesite
What is the composition of Andesite? Intermediate (50% felsic and 50% mafic)

15. Why is it unusual that Obsidian is black
Why is it unusual that Obsidian is black? Most felsic rocks are light in color

16. What happens to temperature when you increase in depth? It increases

17. What is the term called when the temperature increases with depth
What is the term called when the temperature increases with depth? Geothermal Gradient

18. What happens to pressure when you increase in depth? It increases

19. What happens to the melting point of a rock as the water content increases? It decreases

20. Aside from temperature, pressure, and water content, what is another factor that impacts how magma is formed? Its composition

21. What is the texture of obsidian? Glassy and nonvesicular

22. What is the texture of Gabbro? Coarse

23. What does vesicular mean? Gas pockets

24. Which rock will have very coarse texture? Pegamatite

25. How can a rock develop porphyry? It cools at two different rates

26. What three main minerals will granite have
What three main minerals will granite have? Potassium Feldspar Quartz Plagioclase feldspar

27. What are the three main minerals in Obsidian
What are the three main minerals in Obsidian? Potassium Feldspar Quartz Plagioclase feldspar

28. What are the main minerals in Andesite? Plagioclase Biotite Amphibole

29. Dunite is made of which mineral? Olivine

30. Which rocks have amphibole, biotite, pyroxene, plagioclase feldspar and olivine? Basaltic glass, Scoria, Vesicular basalt, basalt diabase and gabbro

31. What is the name of the series that shows the relationship between cooling magma and mineral formation? Bowen’s reaction series

32. How does a rock develop large crystals? Cooling slowly

33. When magma cools, it crystallizes in the reverse order of partial melting. What is the name of the process in which different minerals form at different temperatures? Fractional Crystallization

34. Term for when some minerals melt at low temperatures and others remain a solid Partial melting

35. What does ignis mean in Latin? Fire

36. Identify this rock and list its environment of formation, Crystal size, texture and composition (felsic or mafic)?

37. Granite Intrusive 1 mm to 10 mm Coarse Felsic

38. Identify this rock and list its environment of formation, Crystal size, texture and composition (felsic or mafic)?

39. Pegmatite Intrusive 10 mm or larger Very coarse Felsic

40. Identify this rock and list its environment of formation, Crystal size, texture and composition (felsic or mafic)?

41. Basalt extrusive Less than 1 mm Fine Mafic

42. Identify this rock and list its environment of formation, Crystal size, texture and composition (felsic or mafic)?

43. Andesite extrusive Less than 1 mm Fine Intermediate

44. Identify this rock and list its environment of formation, Crystal size, texture and composition (felsic or mafic)?

45. Pumice Extrusive Non-Crystalline Glassy/Vesicular Felsic

46. Identify this rock and list its environment of formation, Crystal size, texture and composition (felsic or mafic)?

47. Scoria Extrusive Non-Crystalline Glassy/Vesicular mafic

48. Identify this rock and list its environment of formation, Crystal size, texture and composition (felsic or mafic)?

49. Obsidian Extrusive Non-Crystalline Glassy Felsic

50. Identify this rock and list its environment of formation, Crystal size, texture and composition (felsic or mafic)?

51. Gabbro Intrusive 1 mm to 10 mm Coarse mafic

52. Identify this rock and list its environment of formation, Crystal size, texture and composition (felsic or mafic)?

53. Dunite Intrusive 1 mm to 10 mm Coarse mafic or ultramafic

54. Identify this rock and list its environment of formation, Crystal size, texture and composition (felsic or mafic)?

55. Peridotite Intrusive 1 mm to 10 mm Coarse mafic

56. Identify this rock and list its environment of formation, Crystal size, texture and composition (felsic or mafic)?

57. Rhyolite Extrusive Less than 1 mm fine Felsic