Man's physical universe

xanabras

MANY DIFFERENT KINDS OF ROCKS 183

1. What is an igneous rock?

STUDY QUESTIONS

2. Why are some granites fine-grained and other granites coarse-grained?

3. What are the characteristic features of igneous rocks?

4. What are the characteristic features of sedimentary rocks?

5. How may the age of a given sedimentary rock fragment be determined?

6. Outhne the most important type of rocks, and give one or more common

examples of each type.

7. Give some examples of igneous rocks formed by volcanic activities.

8. What types of rocks might a kitchen cleanser contain?

9. In how many different ways may limestone be formed?

10. What is a metamorphic rock? Give some examples. Study the chart on

p. 181 before attempting to answer the following questions:

(1) Would rock salt be classified as a rock, and if so, what type of rock is it?

(2) Name five useful sedimentary rocks.

(3) Classify the following rocks: (a) granite, (b) soft coal, (c) limestone,

(d) sandstone, (e) marble, (/) anthracite coal, (g) slate, (h) conglomerate,

(i) pumice, (j) obsidian.

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