What is global warming?
the gradual increase in the Earth's atmosphere caused by high levels of greenhouse gases
Why is crude oil called a fossil fuel?
because it is made from marine plants and animals
What are organic compounds?
are compounds which contain carbon atoms joined to hydrogen and somethimes other atoms.
Define fractional distillation
a technique used to separate mixture of gases in a crude oil
Which processes turn the remains of ancient plants and animals into fossil fuels?
high temperature and high pressure
Name three greenhouse gases
carbon dioxide, methane and vapor