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a) from rotted sea creatures
b) from rotted animals and plants
c) from rotted fish
d) no answer is correct
8. What are the types of oil bases?
a) asphalt, paraffin and wax bases
b) gasoline and lubricant bases
c) hydrogen or carbon bases
d) no answer is correct
9. Soft rock is represented be the following types of rocks :
(according to the text)
a) marble
b) quartzite
c) sandstone and limestone
d) no answer is correct
10. How are tiny openings called where the oil accumulates:
a) rock
b) reservoir
c) trend
d) pore

Exercise 4. Fill in the gaps
1. Petroleum, paraffin, hydrogen, asphalt, gasoline, carbon,
natural gas, oil, wax, sandstone petrochemicals, limestone ,
animals, plants
2. …… the main product of crude oil runs our cars, trucks,
buses and boats.
3. …… found with petroleum, is burned in millions of
kitchen stoves.
Crude oil is a black, heavy liquid made up almost entirely of
two elements – ……. and carbon.
4…… is a solid which we know best as charcoal or the
graphite in lead pencils.

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