Question

why is the amazon river basin sparsely populated?......plz ans it....geo 7std chap-life in the tropical and subtropical regions

Answer 1

TheAmazon basinis the part ofSouth Americadrained by theAmazon Riverand its tributaries. The Amazondrainage basincovers an area of about 7,500,000 km2(2,900,000 sq mi), or roughly 40 percent of the South American continent. It is located in the countries ofBolivia,Brazil,Colombia,Ecuador,Guyana,Peru,SurinameandVenezuela.[1]Most of the basin is covered by theAmazon Rainforest, also known as Amazonia. With a 5,500,000 km2(2,100,000 sq mi) area of densetropical forest, this is the largestrainforestin the world.GeographyTheAmazon Riverrises in theAndesMountains at the west of the basin with its main tributary theMarañón Riverin Peru. It is usually considered to be thesecond longest river in the world.[2]However, a team of Brazilian scientists has claimed that the Amazon is the longest river in the world.[3]It covers about 6,400 km before draining into theAtlantic Ocean. The Amazon and its tributaries form the largest volume of water. The Amazon accounts for about 20% of the total water carried to the oceans by rivers. Some of theAmazon rainforestsaredeforestedbecause of the increasing of cattle ranches and soy beans field.The highest point in thewatershedof the Amazon is the peak ofYerupajáat 6,635 m (21,768 ft).The Amazon basin formerly flowed west toPacific Oceanuntil the Andes formed, causing the basin to flow eastward towards the Atlantic Ocean.[4]Politically the basin is divided into the BrazilianAmazônia Legal, thePeruvian Amazon, theAmazon region of Colombiaand parts ofBolivia,Ecuadorand the Venezuelan state ofAmazonas.Plant lifeAerial view of part of the Amazon rainforest.Plant growth is dense and its variety of animal inhabitants is comparatively high due to the heavy rainfall and the dense and extensiveevergreenandconiferous forests. Littlesunlightreaches the ground due to the dense roof canopy by plants. The ground remains dark and damp and only shade tolerant vegetation will grow here.Orchidsandbromeliadsexploit trees and other plants to get closer to the sunlight. They grow hanging onto the branches or tree trunks withaerial roots, not as parasites but asepiphytes. Species of tropical trees native to the Amazon includeBrazil nut,rubber treeandAssai palm.[5][6]