# Explain the terms: (1) Aurora Borealis and Aurora Australis (2) Dry adiabatic lapse rate and moist adiabatic lapse rate.

Aurora Borealis and Aurora Australis
Aurora is referred to as polar lights observed around the magnetic poles in the northern as well as in southern hemispheres.  It results due to collisions between electrically charged particles from the sun and the earth’s atmosphere. These bright polar lights are known as “Aurora borealis” in the north and “Aurora australis” in the south.
Atmospheric lapse rate is the change in temperature with height. When the air contains little water, it cools at a rapid rate. This lapse rate is known as the dry adiabatic lapse rate. The rate of temperature decrease is 9.8°C/km. Similarly, when the air contains higher amount of water, it cools at a steady rate. This is known as moist adiabatic lapse rate. The rate is usually less than 6°C/km.

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## Current Affairs MCQs PDF - July, 2022

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