The troposphere is the warmest layer relative to the layers immediately above it because it is heated directly by the Earth’s surface. Sunlight passes through the air and warms the ground, which then radiates heat back into the lower atmosphere. Because the heat source is at the bottom, the air is warmest near the surface and cools with altitude. ANSWER: (A) It is heated by the Earth’s surface
The troposphere is the warmest layer of the atmosphere because – (A) It is heated by the Earth’s surface (B) Heat is generated in it (C) It is closest to the sun (D) It contains charged particles
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The troposphere receives its heat primarily from the planet’s surface through a combination of radiation, conduction and convection. Although the sun is the ultimate energy source, the atmosphere does not absorb solar energy efficiently. Instead, the Earth’s surface absorbs the sun’s rays and then re-emits that energy as infrared radiation. This heat is most concentrated in the lowest part of the atmosphere, making the troposphere warmer than the layers like the mesosphere. This ground-up heating mechanism is why mountain peaks are colder than valleys, despite being technically closer to the sun in the sky.
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