The world’s largest forest covers and vast rivers basins of the Amazon and the Orinoco. The enormous growth of vegetation in this zone is due to its proximity to the equator. It is extremely warm and the air is very humid because of the heavy rainfall that can last from six to eight months.
The sub-equatorial forest is dense and impenetrable with many layers of vegetation, each growing to a different height. Flying over such a forest in an aeroplane one can only see the tops of the highest trees which, massed together, give the impression of an immense sea of green from which only those trees with very tall trunks emerge to heights of more than 40 metres.
Underneath this top layer grow tree ferns and beneath them are shrubs, grasses and climbing plants known as lianas. Human beings or large animals can only go through such forests by following the almost invisible tracks made by animals going to their water holes.
Picture Credit : Google
