The monsoon trough , alternatively known as the intertropical convergence zone , plays a significant role in creating the climatic conditions necessary for the Earth 's tropical rainforests. Tropical rainforests have been called the "jewels of the Earth" and the " world's largest pharmacy ", because over one quarter of natural medicines have been discovered there. The undergrowth in some areas of a rainforest can be restricted by poor penetration of sunlight to ground level. If the leaf canopy is destroyed or thinned, the ground beneath is soon colonized by a dense, tangled growth of vines , shrubs and small trees , called a jungle.
Share facts or photos of intriguing scientific phenomena. The trees in the rainforests are very tall and slender. Most of these trees don't have branches till atleast feet. The tropical rainforests are characterized by a variety of landforms which give rise to a complex ecosystem in this region.