Multiple choice

In a cold day the smoke spreads in a flat layer above the icy cold river rather than rising and dissipating into the atmosphere. It is due to

  1. the decrease in temperature

  2. the increase in temperature

  3. the inversion of temperature

  4. rapid and sudden fall in tempreture over the river.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The atmosphere above a icy cold river depicts inversion of temperature with warm air at the top and cold air near the surface of the river. Warm moist air does rise above a river but expands and cools down and as condensation occurs the air becomes denser and it sinks to lower levels with warm air at the top. If the rising smoke is denser than the upper warm air, it is not able to rise further but spreads out in flat layers.

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