Which of the following atmospheric layers is known for all changes in climate and weather ?

The correct answer is (D) Troposphere.

• The troposphere is the lowest layer of Earth's atmosphere, extending from the surface up to an average height of 8 km at the poles and 18 km at the equator. It contains approximately 75% of the atmosphere's mass and 99% of its total water vapor, making it the zone where virtually all weather phenomena, such as clouds, rain, snow, storms, and climate changes, occur.
• In this layer, temperature decreases with increasing altitude at a standard rate known as the normal lapse rate (approximately 6.5 degrees Celsius per kilometer), driven by the heating of the Earth's surface through solar radiation and subsequent terrestrial radiation.
• Option (A) Thermosphere is characterized by extremely high temperatures due to the absorption of high-energy X-rays and UV radiation from the Sun. Option (B) Stratosphere contains the ozone layer and remains largely free of clouds and weather disturbances, making it ideal for jet aircraft flight. Option (C) Mesosphere is the coldest layer where meteors burn up upon entering the atmosphere.