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Interior of the Earth

ICSE · Class 11 · Geography

Quick revision notes for Interior of the Earth — ICSE Class 11 Geography. Key concepts, formulas, and definitions for last-minute revision.

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Key Topics to Revise

1

Sources of Information About Earth's Interior

  • Direct sources: mines, boreholes, and volcanic eruptions provide limited surface-level data
  • The deepest mine (Robinson Deep, South Africa) is only 4 km deep; deepest oil drill is about 6 km
  • Earth's radius is 6,370 km — making direct observations negligibly small in comparison
2

Internal Properties: Density, Temperature, and Pressure

  • DENSITY: Earth's average density is 5.5 g/cm³ as per Newton's laws of gravity
  • Surface sedimentary rocks have density of 2.7; igneous rocks below have 3.0–3.5 density
  • Core density is estimated at 11–12, rising to 13–14 at Earth's centre
3

Earthquake Waves: Types and Characteristics

  • Three main types of earthquake waves: P-waves, S-waves, and L-waves
  • P-WAVES (Primary waves): Longitudinal waves; particles move in direction of wave propagation
  • P-waves velocity: ~8 km/second — FASTEST of all earthquake waves
4

Behaviour of Earthquake Waves and the Shadow Zone

  • Earthquake waves change their course and velocity at boundaries between different internal zones
  • Waves suffer REFLECTION and REFRACTION when travelling through different media
  • Curved path of waves proves that density increases with depth inside Earth

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Full Notes

Key Concepts

Since direct observation is possible onlyEarth's average density is 5Temperature increases with depth insidePressure increases progressively with depth dueThree types of earthquake waves

Frequently Asked Questions

What are the important topics in Interior of the Earth for ICSE Class 11 Geography?
Key topics in Interior of the Earth include Interior of the Earth — Complete Chapter Overview, Interior of the Earth — Complete Concept Map, Complete Concept Map: Interior of the Earth. These are the concepts ICSE Class 11 examiners draw on most — study them first, then practise related questions.
How to score full marks in Interior of the Earth — ICSE Class 11 Geography?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision 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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