<u>Silicates</u> are the largest and most abundant class of minerals present in the planet, their participation in the formation of terrestrial rocks corresponds to 75%.
The caves with their structures known as stalactites and stalagmites form from the dissolution of calcium <u>carbonate</u> in water.
<u>Oxides</u> are minerals resulting from the combination of oxygen with metals and metalloids.
<u>Sulphides</u> are minerals that arise from the association of sulfur () with metallic elements.
Wood is a flammable substance. Depending how dry it is will determine its flammability or what temperature it will burst into flame. Burning wood undergoes chemical property changes: the brown hard wood becomes a black pile of ashes.