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Earth as a Planet

ICSE · Class 9 · Geography

Quick revision notes for Earth as a Planet — ICSE Class 9 Geography. Key concepts, formulas, and definitions for last-minute revision.

53 questions32 flashcards5 concepts

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An infographic showing the Sun and the eight planets of our solar system, arranged by their distance from the Sun, with their relative sizes indicated. Labels for each planet and their position (e.g.,
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Key Topics to Revise

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1. Earth as a Unique Planet

  • Earth is one of the eight planets of the Solar System.
  • The eight planets in order of distance from the Sun are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
  • The word planet is derived from a Greek word meaning wanderer because planets revolve around the Sun.
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2. Realms of the Earth

  • Earth has three main realms: lithosphere, hydrosphere and atmosphere.
  • Lithosphere is the solid crust of rocks on the Earth's surface.
  • The main part of the lithosphere consists of igneous rocks; the rest consists of sedimentary and metamorphic rocks.
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3. Shape and Size of the Earth

  • Ancient people believed Earth was flat like a table and feared sailing far into the sea.
  • Christopher Columbus had difficulty collecting his crew because of fear of a flat Earth.
  • Ferdinand Magellan's round-the-world expedition in 1519 proved that Earth is round in shape.
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4. Proofs of Earth's Shape

  • All celestial bodies appear to have a circular outline.
  • Circumnavigation of Earth proves its spherical shape.
  • An observer on a cliff sees the mast of an approaching ship first, then the funnel, and lastly the hull.

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Full Notes

Key Concepts

Earth is the third planet fromThe eight planets in orderThe Solar System is a tinyEarth is called the blue planetThe lithosphere is the solid crust

Frequently Asked Questions

What are the important topics in Earth as a Planet for ICSE Class 9 Geography?
Key topics in Earth as a Planet include Earth as a Planet - Complete Overview, Earth as a Unique Planet - Key Features, Earth as a Planet - Complete Overview. These are the concepts ICSE Class 9 examiners draw on most — study them first, then practise related questions.
How to score full marks in Earth as a Planet — ICSE Class 9 Geography?
Understand the core concepts first, then work through the 53 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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