Origin of Earth

Origin of Earth

  • The earth broke off about 4.5 billion years ago with an explosion.
  • It was a burning hot white mass of gas and dust.
  • Over a long period of time, dust and gas gradually condensed to form solid rock.
  • Such condensation and shrinking made the earth heat up so much that the rock melted into a gluey liquid.
  • After millions of years, the outer surface of the earth or the earth’s crust cooled and formed hard rock again, just as melted chocolate or wax solidifies upon cooling.
  • The interior of the earth is still very hot.
  • The crust of the earth was formed from cooling and hardening of the molten matter and hot gases.
  • With cooling of the earth the crust hardened and formed the land.
  • Cooling of the earth also condensed water vapour into liquid water filling the depressions to form seas.