oil - indirect: formed from ancient animals which gained energy from eating plants, i.e. photosynthesis, coal - indirect: formed from ancient forests which got energy via photosynthesis, nuclear - neither: happens due to fission in unstable atoms, gas - indierct: formed from ancient animals which gained energy from eating, i.e. photosynthesis, solar - direct; either heat or light waves, wind - indirect: sun heats surfaces which create air currents, hydroelectric power - indirect: solar energy causes evaporation, tidal - neither: caused by gravitational forces, biofuels - indirect: photosynthesis transforms solar energy into chemical, geothermal - neither: caused by nuclear fission in atoms of rocks,

Sources of energy resources

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