Pothuri Sathish

Tectonic plates are pieces of earth's crust and uppermost mantle,together referred to as the lithosphere.The plates are around 100 km (62 mi)thick and consist of two principal material:ocean -crust(also called sima from silicon magnesium) and continental crust (sial from silicon and aluminium).The composition of the two types of crust differs markedly,with basaltic rocks ("mafic") dominating oceanic crust,while continental crust consists principally of lower density granitic rocks. Geologists generally agree that the following tectonic plates exist on the earth's surface with roughly definable boundaries.Tectonic plates are sometimes subdivided into three fairly arbitrary categories: major (or primary) plates,minor (or secondary) plates, and micro (or tertiary) plates. Major plates : These plates comprise the bulk of  the continents and the pacific ocean .A major plate is any plate with an area greater than 20 million km. Minor plates : These smaller

The concept of supercontinent was first proposed by the Alfred Wegener (His full name is Alfred-Lothar-Wegener) in the year of 1912. He was born on 1 November 1880. He is a German polar researcher, Geophysicist, and Meteorologist. The reason behind he proposed this concept is he found some fossil's which lived on the earth. In all the continents but the distance between the continents are so long. That is the reason he proposed his concept of continental drift.  This continental drift was controversial and not widely accepted because he did not prove that how the continents are moved due to this reason every not accepted until the 1950's. After tectonic plates was discovered based on this tectonic plates the continents are moved. now we assume that how the modern continents was placed. Alfred-Lothar-Wegener FOSSIL Every 300-500 Million years the supercontinent was formed. In 300 Million years ago one supercontinent was formed it was named as PANGAEA. The word P