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8.2 Activities
Activity 1. Match the terms with their definitions
1. andesite
2. basalt
3. granite
4.igneous rocks
5. obsidian
A- is a fine-grained, extrusive igneous rock composed
mainly of plagioclase with other minerals such as
hornblende, pyroxene and biotite.
B- is a fine-grained, dark-colored extrusive igneous rock
composed mainly of plagioclase and pyroxene
C- is a coarse-grained, light colored, intrusive igneous
rock that contains mainly quartz and feldspar minerals
D- is a dark-colored volcanic glass that forms from the
very rapid cooling of molten rock material. It cools so
rapidly that crystals do not form.
E- have solidified from lava or magma
Activity 2. Mark the sentences “True” or “False” ()
True
False
1. Igneous rocks have crystallized from solidified magma.
2. The grain size of igneous rocks does not depend on their
occurrence.
3. The intrusive rocks generally cool more slowly than the
extrusive rocks.
4. Extrusive igneous rocks have been formed from lava flows
5. Basalt is not the principal rock type of the ocean floor.
Activity 3. Match the beginnings of sentences to their endings
1. Igneous rocks
2. There are two basic types:
3. The terms intrusive and extrusive
4. Extrusive rocks are rich in minerals
A- intrusive igneous rocks and
extrusive igneous rocks
B- have crystallized from solidified
magma
C- that are important economically or
have great scientific value
D- iron, gold, nickel and other ferrous
metals.
5. Igneous rocks and their veins are rich E- refer to the place where rocks are
in
solidified.
Activity 4. Answer the following questions
1. How are igneous rocks formed?
2. What are the basic types of igneous rocks?
3. How are the largest bodies of igneous rocks called?
4. What is the principal rock type of the ocean floor?
5. What is the difference between laccoliths and sills?
6. How do dykes range in thickness?
7. Where can you find granite?
8. What do you know about pegmatites?
9. What kinds of rocks have been formed from lava flows?
10.What do you know about extrusive igneous rocks?
Activity 5. Make the instructions. Make up a monologue on igneous rocks:
a) You have recently inherited a small business and you would like to operate
it. You need the information on igneous rocks. It will be the main part of your
business. But your business partner is absolutely against it. He knows nothing
about igneous rocks. Tell him about them and try to persuade him that it
would be a valuable learning experience and you can make a big profit. Use
the information from the text.
b) Your friend is eager to become a sole proprietor but he does not know
anything about igneous rocks though he has money. He asks you to give him
some information on the question. You are a good specialist in geology and
you are eager to help him.