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lnsolation

ICSE · Class 9 · Geography

Quick revision notes for lnsolation — ICSE Class 9 Geography. Key concepts, formulas, and definitions for last-minute revision.

58 questions36 flashcards5 concepts

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A comparison chart illustrating the key differences between insolation (incoming solar radiation) and terrestrial radiation (outgoing Earth radiation), including their sources, wavelengths, and heatin
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Key Topics to Revise

1

1. Meaning of Insolation and Solar Energy

  • The Sun is a star of average size and has a surface temperature of about 6000°C.
  • Solar energy travels in the form of rays at a speed of about 30,000 km/sec and takes nearly 8 minutes to reach the Earth.
  • Insolation is the solar radiation intercepted by the Earth.
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2. Heating of the Atmosphere and Terrestrial Radiation

  • Our atmosphere is not directly heated from the Sun above, but by terrestrial radiation given out by the Earth.
  • There are three main processes by which the Earth’s atmosphere is heated: convection, conduction, and radiation.
  • Convection is the transmission of heat by movement of particles in a liquid or gas.
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3. Differential Heating of Land and Water

  • Land and water surfaces absorb and give out heat differently.
  • Land surface is rapidly and intensely heated under the Sun’s rays whereas water surface gets moderately heated.
  • Land surface cools off more rapidly than water.
4

4. Factors Affecting Distribution of Temperature

  • The horizontal distribution of temperature is normally determined by latitude.
  • Temperature generally decreases from the Equator towards the poles.
  • Nine factors affect the horizontal distribution of temperature besides latitude alone.

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Full Notes

Key Concepts

Insolation is the solar radiation interceptedThe Sun is a starTerrestrial radiation is long wave electromagneticThe atmosphere is heated by convectionThe amount of insolation reaching

Frequently Asked Questions

What are the important topics in lnsolation for ICSE Class 9 Geography?
lnsolation covers several key topics that are frequently asked in ICSE Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in lnsolation — ICSE Class 9 Geography?
Understand the core concepts first, then work through the 58 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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