Question

comparison of sources of energy​

Answer 1

Answer:

There are three main categories of energy sources: fossil fuel, alternative, and renewable. Renewable is sometimes, but not always, included under alternative. Fossil fuels formed over millions of years ago as dead plants and animals were subjected to extreme heat and pressure in the earth's crust.

Answer 2

Explanation:

The overall evaluation of an energy source is based not only on how clean it is; it also has to be reliable, accessible, and affordable. Not all of these factors can be categorized neatly. For example, petroleum tends to be relatively affordable in the United States, but that is in part because the government subsidizes fossil fuel industries. Similarly, while wind energy tends to be relatively expensive, its cost has been steadily declining for years as its use increases.