Which of the following is an example of a non-renewable energy source?

Coal is indeed an example of a non-renewable energy source because it is formed from ancient organic matter over millions of years and is extracted from the Earth in a finite quantity. Once coal is burned for energy, it cannot be replaced within a human timescale, leading to its classification as non-renewable. This means that the availability of coal is limited, and once existing reserves are depleted, they will not be replenished.

In contrast, wind and solar energy are considered renewable because they are continuously replenished by natural processes. Wind is generated by atmospheric conditions and can be harnessed as long as the sun heats the Earth, creating wind currents. Similarly, solar energy comes from sunlight, which is a constant and renewable resource. Water, while it can be limited in availability depending on geographical and climatic conditions, is utilized in energy generation through hydroelectric power but is still considered renewable as the water cycle allows for its continual replenishment. Thus, understanding the classifications of energy sources is crucial for discussions on sustainability and energy management.