. a) Classify the following into renewable and non-renewable sources of energy: Coal, wind, tides, petroleum, wood , natural gas b) What is the basis of above classification?

1. Renewable sources of energy: wind, tides, and wood

Non-renewable sources of energy: coal, petroleum, and natural gas.

1. The above classification of sources of energy is based on the inexhaustible and exhaustible characteristic of renewable and non-renewable sources of energy respectively.