Question

Sleet is a form of
1. Precipitation
2. cyclone
3. greenhouse gas
4. None of the above

Answer 1

Correct Answer - Option 1 : Precipitation

The correct answer is Precipitation.

• Sleet is a form of Precipitation.
• The icy precipitation known as sleet forms when a thin layer of warmer air comes between layers of cold air.
• A top layer of below-freezing air creates ice crystals that melt as they fall through a thin layer of above-freezing air.
• If there's enough room between the warmer air and the ground, the water droplets re-freeze in a bottom layer of below-freezing air and fall as sleet. 

• A cyclone is a system of winds rotating counterclockwise in the Northern Hemisphere around a low-pressure center.
• The swirling air rises and cools, creating clouds and precipitation.
• There are two types of cyclones:
  • middle latitude (mid-latitude) cyclones and tropical cyclones.
  • Mid-latitude cyclones are the main cause of winter storms in the middle latitudes.
  • Tropical cyclones have many names.
  • They are called hurricanes in the North Atlantic and eastern Pacific oceans, typhoons in the western Pacific Ocean, tropical cyclones in the Indian Ocean, and Willi-Willi's in the waters near Australia.
• Greenhouse gases are gases in Earth’s atmosphere that trap heat.
• They let sunlight pass through the atmosphere, but they prevent the heat that the sunlight brings from leaving the atmosphere.
• The main greenhouse gases are:
  • Water vapor
  • Carbon dioxide
  • Methane
  • Ozone
  • Nitrous oxide
  • Chlorofluorocarbons