is a fine-grained, dark brown or black rock from which oil can be extracted. The oil
content however is low. When crushed and refined most oil shales yield only about 5-10 gallons per
ton of rock.
Oil shale is not really important
as of yet but it may become important as the world supply of petroleum starts to diminish. The source of
oil is a substance called kerogen, formed from decayed plants. This is trapped in the oil shale.
Oil spills cause a lot of pollution and often many animals and plants
die as a result. The Exxon Valdez oil tanker released 35.000
tonnes of toxic oil off the coast of Alaska. Although attempts
were made to clean up the oil, thousands of seabirds and many
other animals were killed by this environmental disaster.
The worksheets on this page come from the linked workbooks and have this assignment
and lots of other fun science and mixed worksheets that are related to the science names projects and other learning areas.
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