6Week Test Study Guide

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6-Week Test Study Guide
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1. Why would rocks such as obsidian, pumice, and
scoria have no mineral grains?

• Because they cool very quickly

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2. What kind of rock is coal?

• Organic sedimentary rock

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3. In which type of rock would you likely find
fossils?

• Sedimentary

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4. What substance plays an important role in
chemical weathering?

• water

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5. What processes help to change rock into soil
and therefore change the soil profile?

• Physical chemical weathering

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6. What is the rock cycle?

• The process by which one type of rock can be
  changed into another type of rock.

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7. What chemical sedimentary rock is used in the
food industry?

• halite

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8. What horizon in the soil profile is affected
most by weathering erosion?

• Horizon A

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9. What does a foliated metamorphic rock look
like?

• It will have layers or bands

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10. What do you call the breakdown of rocks and
minerals without a change in composition?

• Physical weathering

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11. If you dissolve limestone in acid, what
geologic process is this similar to?

• Chemical weathering

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12. When granite is subjected to heat and
pressure, what rock will it change into?

• gneiss

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13. Why is slate a good rock to use for roofing
shingles?

• It can be split into thin, flat layers.

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14. What rocks are formed by the cementing of
weathered materials?

• Sedimentary rocks

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15. Why would an igneous rock have primarily
large crystals?

• Because it cooled slowly inside the Earth. (from
  magma)

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16. On the back of your sheet, draw a simple
sketch of what you think each of the 3 types of
rocks look like.
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17. What kind of igneous rocks have large
crystals?

• Intrusive Igneous rocks

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18. What determines the size of the mineral
grains in an igneous rock?

• The cooling rate of the molten rock.

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19. How do you classify igneous rocks?

• Intrusive or Extrusive
• Basaltic, Granitic, or Andesitic

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Also, be sure to study ALL of the questions from
the first 3-week Test!!!!!