This document discusses sources of energy, distinguishing between non-renewable sources like crude oil, natural gas, and coal that come from the ground or seabed and will eventually run out, and renewable sources like solar, wind, and water energy that do not run out and do not cause pollution. It provides details on how crude oil, natural gas, and coal are extracted using drills and burned to produce thermal energy, while solar panels convert sunlight into electrical or thermal energy, wind turbines convert wind into electricity, and hydroelectric power stations convert water movement into electricity.