I. Nonrenewable Energy Sources

Oil is commonly referred to as a fossil fuel because it is made of hydrocarbons formed by fossilized animals, plants, and algae. The natural process that creates oil doesn’t happen quickly; for example, most of the oil deposits that produce oil today were formed in the Mesozoic Age between 250 to 66 million years ago. Because humans use oil for energy at a faster rate than oil can be replenished in its natural process, oil and other fossil fuels are considered ...