Our Home: Earth, a Unique Life Sustaining Planet
CBSE · Class 8 · Science
Summary of Our Home: Earth, a Unique Life Sustaining Planet for CBSE Class 8 Science. Key concepts, important points, and chapter overview.
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Overview
Earth is the third planet from the Sun and the only known planet where life exists. It is called the Blue Planet because most of its surface is covered with water. Life survives on Earth because several parts work together in balance: the atmosphere, hydrosphere, geosphere, biosphere, and magnetic f
Key Concepts
Earth is the only known planet
Earth is the only known planet where life exists. Its crust is very thin compared with the size of the planet, yet it supports all living things. Eart
The eight planets in increasing order
The eight planets in increasing order of distance from the Sun are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Mercury, Venus,
The habitable zone
The habitable zone, also called the Goldilocks zone, is the range of distances from the Sun or another star where water can remain liquid. Earth lies
Venus is the hottest planet
Venus is the hottest planet, with an average temperature of 450°C, even though Mercury is closer to the Sun. Venus has a thick atmosphere rich in carb
Earth’s atmosphere provides oxygen for breathing
Earth’s atmosphere provides oxygen for breathing and helps keep the temperature suitable for life. Some oxygen changes into ozone, which forms the ozo
Learning Objectives
- Understand why Earth is a unique planet that supports life
- Recall the position, size, atmosphere, and temperature of the planets related to Earth
- Explain the meaning of habitable zone or Goldilocks zone
- Describe how Earth’s atmosphere, water, land, and magnetic field support life
- Identify the four Earth systems: atmosphere, hydrosphere, geosphere, and biosphere
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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