2. Rock Types and Definitions: Look up (and write down) short definitions/explanations for the following terms

Transcription

1 1. CD-ROM: Go through the Igneous Rocks section of your lecture text CD-ROM (and/or the chapter in your lab manual and/or lecture textbook, but most students like the CD-ROM better) 2. Rock Types and Definitions: Look up (and write down) short definitions/explanations for the following terms 3. Quiz questions: included here answer them before taking the quiz online. igneous sedimentary metamorphic intrusive extrusive plutonic volcanic sialic mafic vesicles granite gabbro basalt rhyolite obsidian pumice scoria porphyry Page 1

2 Example Quiz Questions 1. These types of rocks were once molten 2. These types of rocks are an accumulation of particles or debris 3. These types of rocks have been altered or deformed by heat or pressure (squeezed, smashed or cooked) without being melted. 4. Igneous Rocks were once molten 5. Sedimentary rocks were smashed, altered and/or deformed. 6. Metamorphic rocks are accumulations of debris or particles. 7. Vesicles are pieces of sedimentary rocks in igneous rocks. 8. A porphyry is an igneous rock that is more than 50% gas-bubble holes. 9. Mafic rocks are generally light colored, low density rocks. 10. Sialic rocks are rich in silicon and aluminum. 11. Intrusive rocks have large crystals because they cool very slowly - miles deep inside the earth. Page 2

3 12. A light-colored igneous rock has what chemistry? 13. A dark-colored igneous rock has what chemistry? 14. What is the chemistry of granite? 15. What is the chemistry of gabbro? 16. What is the chemistry of rhyolite? 17. What is the chemistry of basalt? 18. Intrusive rocks have what texture? Page 3

4 19. Extrusive rocks have what texture? 20. Plutonic rocks have what texture? 21. Volcanic rocks have what texture? 22. Volcanic rocks are also called 23. Plutonic rocks are also called 24. Sialic refers to a rock rich in (pick all correct choices) aluminum iron magnesium silicon 25. Mafic refers to a rock rich in (pick all correct choices) aluminum iron magnesium silicon Page 4

5 Identify these rocks from their photos 26. basalt 27. gabbro 28. granite 29. obsidian 30. pumice 31. rhyolite 32. scoria Note: the rock photos look better on the computer screen than printed Page 5

6 33. Pick all correct choices for granite 34. Pick all correct choices for gabbro 35. Pick all correct choices for basalt 36. Pick all correct choices for rhyolite Page 6

7 37. Pick all correct choices for obsidian glass 38. Which of the following apply to a porphyry? (pick all correct choices) more than 50% vesicles started to cool down deep, and finished cooling on/near the surface two crystal sizes glass 39. Which of the following apply to scoria? (pick all correct choices) less than 50% vesicles more than 50% vesicles started to cool down deep, and finished cooling on/near the surface two crystal sizes glass 40. Which of the following apply to pumice? (pick all correct choices) less than 50% vesicles more than 50% vesicles started to cool down deep, and finished cooling on/near the surface two crystal sizes The whole point of this pre-lab is to make the 3-hour lab easier for you. You need to be familiar with the vocabulary and concepts before the lab starts...otherwise you won't know what you are doing...and your lab partners aren't going to want to work with you! If you work through these questions and look up all of the answers and write them down, then the online quiz should be a "piece of cake". The online quiz is open notes and open book; however, it is timed...and if you have not looked up the answers ahead of time, you will not have time to look them up during the quiz. Page 7