Which of the following is not a fossil fuel?

Crude oil
Natural gas
Wind energy
Coal

Wind energy is not a fossil fuel.

Wind energy is not a fossil fuel. Fossil fuels are formed over millions of years from the remains of prehistoric plants and animals. Crude oil, natural gas, and coal are all examples of fossil fuels. Wind energy, on the other hand, is a form of renewable energy that is generated from the wind. It is harnessed using wind turbines and does not involve the burning of fossil fuels.