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Formation of the Earth

ICSE · Class 11 · Geography

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

65 questions35 flashcards5 concepts

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Key Topics to Revise

1

Age of the Earth

  • The earth is generally believed to be four to five billion years old.
  • Almost nothing is known about the conditions of the earth during the first one billion years before consolidation of its crust.
  • Modern scientific methods for finding the age of the earth have been used for about two centuries.
2

Tidal Force Method

  • The first tidal method is based on the idea that the moon was once very close to the earth and moved away slowly.
  • On this basis, the age of the earth has been calculated as 4000 million or 4 billion years.
  • The second tidal method uses the present rate of recession of the moon.
3

Methods Based on Rocks and Oceans

  • The age of the sedimentary rocks has been calculated as 4 billion years by the sedimentation method.
  • Scientists believe erosion could not have started for at least one billion years after the earth's birth, so the earth's age is about 5 billion years by this method.
  • The rate of sedimentation per year is not the same every year and differs from place to place.
4

Radioactivity Method

  • The radioactivity method is considered the most reliable and accurate method.
  • Pierre Curie discovered in 1903 that radioactive elements are continuously disintegrated and generate heat.
  • Rutherford suggested in 1904 that the age of rocks can be calculated on the basis of radioactive elements.

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Full Notes

Key Concepts

The earth is generally believedIn the first tidal methodThe age of the earthThis method estimates age fromThe age of the oceans

Frequently Asked Questions

What are the important topics in Formation of the Earth for ICSE Class 11 Geography?
Key topics in Formation of the Earth include Chapter Overview: Formation of the Earth, Timeline of Major Hypotheses on the Origin of the Earth, Timeline of Hypotheses on Origin of 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 Formation of the Earth — ICSE Class 11 Geography?
Understand the core concepts first, then work through the 65 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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