The earth is believed to have been formed from a small a part of the solar and many of the theories concerned with the origin of the earth emphasize that the planet originated as a scorching gaseous mass which upon cooling, turned, first liquid after which strong. An early principle was put forth by Kant, which is popularly often called the gaseous hypothesis. A more fashionable principle was advanced by Laplace which is known as the nebular speculation. This principle considers earth as having been shaped by means of the solidification of the mass of a hoop thrown away by a cooling and rotating nebula (sun) and this ring was one of the nine such rings which have shaped various planets.

Straight above the stratosphere, extending from 50 to 80 km above the Earth’s surface, the mesosphere is a cold layer where the temperature typically decreases with growing altitude. Right … Read the rest