Classify the following into renewable and non-renewable sources of energy:

Coal, Wind, Tides, Petroleum, Wood, Natural gas

Name two sources of energy that you think are renewable. Give reason for your choice.

Name two sources of energy which you consider to be non-renewable. Give reason for your choice.

Non- Renewable source of energy - coal, petroleum, natural gas.

Coal is said to be formed from the wood of trees. Why then is coal considered to be a non-renewable sources of energy whereas wood is a renewable sources of energy?