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

Question

UnlockIAS · Accepted Answer

Correct — D, Troposphere. The troposphere is the lowest layer of the atmosphere, extending from the Earth's surface up to roughly 8–18 km (lower over the poles, higher over the equator). It holds almost all of the atmosphere's water vapour, dust and cloud-forming moisture, and its temperature falls steadily with height, driving the vertical air movement that produces clouds, rain and storms. Because virtually all weather activity is confined to this layer, it is the one known for changes in climate and weather.

Why the other options are wrong — (a) The outermost, highest layer, home to the ionosphere; air is extremely thin here and temperature rises sharply from absorbed high-energy solar radiation — associated with auroras and satellite orbits, not weather.  (b) Lies above the troposphere and contains the ozone layer; it is stratified with little vertical mixing, making it calm and largely free of the turbulence that produces weather.  (c) The coldest atmospheric layer, above the stratosphere, where most meteors burn up on entry — too high and too thin to generate weather.

Concept: The atmosphere is divided into layers based on how temperature changes with altitude. The troposphere, the lowest and densest layer, holds about three-quarters of the atmosphere's total mass and nearly all its water vapour — the raw material for clouds and precipitation. Its temperature decreases with height, driving convection, cloud formation and storms, which makes it the layer of active 'weather.' The layers above it (stratosphere, mesosphere, thermosphere) are progressively thinner and largely free of this activity.

State PCS 2023 Q56 — Geography PYQ with Answer

State PCS 2023 Q56 — Geography PYQ with Answer