Memory Game MATTER AND ENERGY, CALP, YEAR 1Online version Listen, read and match. by Rafael Rodríguez Pérez Pure substances are made of 1 thing. Energy can be produced from non-renewable sources. Some materials change their state. Materials can be natural or manufactured. Energy can be produced from renewable sources. Materials can be rough, smooth, soft, hard, rigid, flexible, transparent or opaque. Mixtures are made of more than 1 thing.