cinetig, kinetic, potensial, potential, cemegol, chemical, disgyrchiant, gravity, elastig, elastic, trosglwyddo, transfer, anewyddadwy, renewable, anadnewyddadwy, non-renewable, effeithiolrwydd, efficiency, yr effaith ty gwydr, greenhouse effect, cynhesu byd eang, global warming, carbon deuocsid, carbon dioxide, sbectrwm electromagnetig, electromagnetic spectrum, dargludiad, conduction, darfudiad, convection, pelydriad, radiation
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Egni
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