Q1
What is insolation?
ASolar energy Earth receives
BOnly Earth's rotation
COnly Earth's revolution
DNothing specific
ICSEClass 9 (ICSE)GeographyCh 10 · Topic 1
Insolation and Heat Balance
Insolation is the solar energy received by Earth, and heat balance refers to how Earth maintains a stable temperature by balancing incoming
Core concept
Insolation varies by latitude, with the equator receiving more direct sunlight than the poles, creating temperature differences across Earth.
How it works
Earth absorbs solar energy but also radiates heat back into space, and this balance keeps Earth's overall temperature relatively stable.
Why it matters
Factors like cloud cover, atmospheric composition, and surface type (land, water, ice) affect how much insolation is absorbed or reflected.
Key detail
Understanding insolation and heat balance helps explain climate patterns, seasonal variations, and the greenhouse effect's role in global warming.
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Quick notes
• Insolation is solar energy Earth receives.
• It varies by latitude.
• The equator receives more direct sunlight than poles.
• Earth absorbs and radiates heat back to space.
• This balance keeps temperature stable.
• Cloud cover and surface type affect absorption.
• This explains climate patterns.
• It also relates to the greenhouse effect.