geology review 2

geology review 2 - GEOL 101 - PHYSICAL GEOLOGY Example Test...

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GEOL 101 - PHYSICAL GEOLOGY Example Test Questions – Section 2 IGNEOUS ROCKS 1. Which of the following igneous rocks would be richest in ferromagnesian minerals : a. basalt c. granite b. peridotite d. obsidian 2. Which magma type would have the lowest viscosity: a. peridotite c. granite b. basalt d. andesite 3. Which of the following types of pluton is concordant: a. sill c. batholith b. dike d. lopolith 4. The first mineral to melt if we heat a granite should be: a. quartz c. biotite mica b. olivine d. amphibole 5. Lavas extruded onto the earth's surface are fine-grained because: a. the lava crystallizes under very low-pressure conditions b. rapid cooling does not allow sufficient time for large crystals to form c. they are made up of minerals which never form large crystals d. there is very little water in the magma 6. Which of the following igneous rocks would be richest in quartz and potassium feldspar: a. basalt c. granite b. andesite d. peridotite 7. Gas bubbles trapped in a lava and subsequently filled with secondary minerals are called: a. porphyries c. xenoliths b. phenocrysts d. amygdules 8. Which of the following igneous rocks have essentially the same chemical composition: a. peridotite & granite c. granite & gabbro b. andesite & granite d. basalt & gabbro 9. An igneous rock with large crystals in an otherwise fine-grained rock is called a(n): a. vesicle c. porphyry b. amygdule d. xenolith 10. A silicate magma or igneous rock rich in quartz and potasium feldspar (orthoclase) is described as: a. felsic or acidic c. mafic b. basic d. ultramafic 11. Fragments of partially digested sedimentary rock in an intrusive igneous body are: a. phenocrysts c. amygdules b. vesicles d. xenoliths
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12. Polygonal shrinkage cracks found in many igneous bodies are referred to as:
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geology review 2 - GEOL 101 - PHYSICAL GEOLOGY Example Test...

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