Layers in rainforests are growth zones, which are determined by the height of the plants growing there. There are five layers in the rainforest. The soil or root layer contains roots as well as tiny animals and algae, the herb layer above it contains mosses and ferns, and the shrub layer above that has shrubs and young trees with a height of about 5 m. This is followed by a zone of the 'small trees', and then the zone of the treetops, which reaches a height of around 40 m. Tropical rainforests are the 'jewels of the Earth' because more than one-fourth of natural medicines have been discovered here.
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