Dr.Lakhimi Gogoi

Rainforests are forests characterized by high rainfall. Rainforest , also spelled rain forest , luxuriant forest, generally composed of tall, broad-leaved trees and usually found in wet tropical uplands and lowlands around the Equator. Rainforest is believed to be the oldest living ecosystems on Earth which gets maximum amount of rainfall. Most of the rainforests in this world are located around the middle of earth near the equator like South and Central America, Africa, Asia and Australia. A tropical woodland with an annual rainfall of at least 100 inches (254 centimeters) and marked by lofty broad-leaved evergreen trees forming a continuous canopy . Different Layers of Rainforest A rainforest is divided into following 4 layers. Each layer has characteristic flora and fauna adapted for life in the particular surroundings. 1. The Emergent layer The emergent layer is made up of the tallest trees, standing as high as 200 feet, towering above the canopy layer that f...

A waterfall may be defined as a vertical drop of water of enormous volume from a great height in the long profiles of the river. Waterfalls also occur where melt water drops over the edge of a tabular iceberg or ice shelf.        Waterfalls are commonly formed in the upper course of a river in steep mountains. Because of their landscape position, many waterfalls occur over bedrock fed by little contributing area, so they are ephemeral and only occur during rainstorms. Waterfalls or falls are caused because of sudden descents or abrupt breaks in the longitudinal course of   the rivers due to a host of factors e.g   variation in the relative resistance of rocks, relative difference in topographic reliefs, fall in the sea level and relative rejuvenation, earth movements etc.        A fall line is the imaginary line along which parallel rivers plunge as they flow from uplands to lowlands. Many waterfall...