●  The troposphere is thicker over the equator than the poles because the equator is warmer. Heat differential on the planet's surface causes convection currents to flow from the equator to the poles.

●  The earth's atmosphere is typically 480 kilometres thick. 99% of the thickness is found up to 32 km above the surface of the earth.

●  The atmosphere is divided into layers with different temperatures and densities.

●  Density decreases with increasing height and reaches its maximum level very close to the earth's surface.

●  The troposphere is the lowest layer of the atmospheric. The average height is 13 km, it is about 8 km high at the poles and 18 km high at the equator.

●  Since heat is carried to vast heights by powerful convectional currents, the troposphere is thickest at the equator.

●  All climatic and meteorological change takes place in the troposphere.