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Our Home: Earth, a Unique Life Sustaining Planet

CBSE · Class 8 · Science

Quick revision notes for Our Home: Earth, a Unique Life Sustaining Planet — CBSE Class 8 Science. Key concepts, formulas, and definitions for last-minute revision.

44 questions80 flashcards5 concepts

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Key Topics to Revise

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1. Why Earth is unique

  • Earth is the only known planet where life exists.
  • Earth has a thin life-supporting crust, compared to an apple's skin.
  • Earth provides air to breathe, water to drink, soil to grow crops, and materials like rock and timber for human needs.
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2. Solar system and planet comparison

  • The solar system has eight planets in this order from the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
  • Mercury, Venus, Earth, and Mars are small, rocky planets.
  • Jupiter, Saturn, Uranus, and Neptune are large planets, mostly made of gases.
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3. Temperature, atmosphere, and the greenhouse effect

  • Venus is the hottest planet not because it is closest to the Sun, but because its thick atmosphere traps heat.
  • Venus has an atmosphere made mostly of carbon dioxide.
  • The greenhouse effect on Venus stops heat from escaping.
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4. Why Earth can support life

  • Earth is at the right distance from the Sun for water to remain in liquid form.
  • The range of distances from the Sun where water remains liquid is called the habitable zone or Goldilocks zone.
  • Mars lies at the edge of the Sun's habitable zone.

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Full Notes

Key Concepts

Earth is the only known planetThe eight planets in increasing orderThe habitable zoneVenus is the hottest planetEarth’s atmosphere provides oxygen for breathing

Frequently Asked Questions

What are the important topics in Our Home: Earth, a Unique Life Sustaining Planet for CBSE Class 8 Science?
Our Home: Earth, a Unique Life Sustaining Planet covers several key topics that are frequently asked in CBSE Class 8 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Our Home: Earth, a Unique Life Sustaining Planet — CBSE Class 8 Science?
Understand the core concepts first, then work through the 44 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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