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Air — Social Studies STD 7 — Question

CBSE BoardEnglish MediumSTD 7Social StudiesAir2 Marks
Question
Explain the circulation of air in atmosphere.
✓

Answer

When air is heated it expands, becomes lighter and rises up:
  • Cold air is dense, so, it sinks down.
  • When hot air rises up, cold air from surrounding areas fills in the gap.
  • This is the process of circulation of air.
NOTES: News reports around the world.
  • Due to burning of fuels and cutting of trees $CO_2$ level are increasing
  • Globed sunscreen thinned
  • Warning unstoppable
  • It can bring back Jurassic era.

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