Crude oil is found in the Earth's crust. It can be pumped to the surface.
Crude oil is transported to refineries through pipelines or in oil tankers.
Accidents can cause oil spills from a tanker and the oil floats on the sea's surface as a slick. This can harm wildlife and damage beaches.
The oil can affect lots of wildlife, including birds. The birds' feathers get stuck together and the birds may die.
Detergents are used to break up oil slicks, but these chemicals are toxic and can harm or kill wildlife.
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