7 IMPORTANCE OF EARTH'S ATMOSPHERE
what is the earth's atmosphere? The Atmosphere can be defined as the gaseous envelope surrounding the earth. The atmosphere can also be defined as a grand body from the earth's surface to outer space and composed of a number of gases. The estimated mass of the atmosphere is 5.6 × 1014 metric tonnes. It extends over about 400 km height and meteorological events and effects occur in it. The thickness of the gaseous envelope is equal to 1% of the earth’s mean radius. The usefulness of the atmosphere: It fulfills the biological oxygen demand (BOD) of animal life. It supplies the necessary precipitation or moisture . It protects the biological life on the planet from harmful extraterrestrial radiations like UV, by absorbing it through the ozone. It maintains the warmth of the planet through its greenhouse effect, avoiding the temperature to fall to two extreme limits.(The earth’s temperature in the absence of an atmosphere would have been +950C (...