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Q: The lowest layer of atmosphere is called……….
  • A. Stratosphere
  • B. Troposphere
  • C. Genoshere
  • D. Exosphere
Correct Answer: Option B - The atmosphere is a blanket of gases which surrounds the earth. It is held near the surface of earth by its gravitational force of attraction. The atmosphere consists of several layers. 1. Troposphere – Lowest layer of the atmosphere with an average height of 18 km over tropics and 6 km over polar regions. All the weather phenomena occur in this layer. 2. Stratosphere–It has an average height from tropopause to 50 km. It is free from weather phenomena and ideal for planes and aircrafts. It also contains Ozone layer. 3. Mesosphere –Its average elevation is 50-80 km, here the temperature decreases along with increasing height . 4. Ionosphere –It extends from 80 km –640 km. here the temperature increases on increase height. Its the travelling zone for long radio waves. 5 Exosphere–It's the outermost layer of atmosphere here Hydrogen & Helium occur in high concentration.
B. The atmosphere is a blanket of gases which surrounds the earth. It is held near the surface of earth by its gravitational force of attraction. The atmosphere consists of several layers. 1. Troposphere – Lowest layer of the atmosphere with an average height of 18 km over tropics and 6 km over polar regions. All the weather phenomena occur in this layer. 2. Stratosphere–It has an average height from tropopause to 50 km. It is free from weather phenomena and ideal for planes and aircrafts. It also contains Ozone layer. 3. Mesosphere –Its average elevation is 50-80 km, here the temperature decreases along with increasing height . 4. Ionosphere –It extends from 80 km –640 km. here the temperature increases on increase height. Its the travelling zone for long radio waves. 5 Exosphere–It's the outermost layer of atmosphere here Hydrogen & Helium occur in high concentration.

Explanations:

The atmosphere is a blanket of gases which surrounds the earth. It is held near the surface of earth by its gravitational force of attraction. The atmosphere consists of several layers. 1. Troposphere – Lowest layer of the atmosphere with an average height of 18 km over tropics and 6 km over polar regions. All the weather phenomena occur in this layer. 2. Stratosphere–It has an average height from tropopause to 50 km. It is free from weather phenomena and ideal for planes and aircrafts. It also contains Ozone layer. 3. Mesosphere –Its average elevation is 50-80 km, here the temperature decreases along with increasing height . 4. Ionosphere –It extends from 80 km –640 km. here the temperature increases on increase height. Its the travelling zone for long radio waves. 5 Exosphere–It's the outermost layer of atmosphere here Hydrogen & Helium occur in high concentration.