Kerala PSC - SUPERINTENDENT WELFARE INSTITUTION GR.I - Geography | Module 2

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In Climatology – Part 1, we begin Kerala PSC Module 2 by understanding the atmosphere as a dynamic system that redistributes heat and moisture and forms the foundation for weather and climate.

This lesson introduces the composition of the atmosphere, including nitrogen, oxygen, argon and carbon dioxide, along with important variable constituents such as water vapour, ozone and aerosols. It also explains the thermal layering of the atmosphere—the troposphere, stratosphere, mesosphere and thermosphere—and how temperature changes with altitude in each layer.

Special attention is given to important PSC associations such as nitrogen and oxygen forming about 99% of dry air, the role of ozone in absorbing ultraviolet radiation, and the atmospheric boundaries tropopause, stratopause and mesopause. The lesson builds the conceptual foundation required for later topics such as temperature, pressure, winds, rainfall and monsoon circulation.

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