Class 8 Science - ODISHA
Our Home: Earth a Unique Life-Sustaining Planet
This chapter explores why Earth is the only known planet in our solar system that supports life. Class 8 students under the Odisha BSE board will learn about Earth's unique position in the solar system, the presence of water, a breathable atmosphere, and the ideal temperature range known as the Goldilocks zone. We examine the four major realms of the Earth—lithosphere, hydrosphere, atmosphere, and biosphere—and how they interact to sustain living organisms. Understanding these life-supporting conditions is crucial for environmental awareness and carries significant weight in board exam assessments regarding geography and environmental science.
Start Learning FreeKey Concepts
Habitable Zone
Earth is located at a precise distance from the Sun, neither too hot nor too cold, allowing water to exist in liquid form which is essential for life.
Atmosphere
A blanket of life-giving gases like oxygen, nitrogen, and carbon dioxide that protects living beings from harmful UV rays and maintains Earth's temperature through the greenhouse effect.
Hydrosphere
The water realm covering about 71 percent of Earth's surface, including oceans, rivers, and ice caps, which provides the medium for all biological processes.
Lithosphere
The solid outer crust of the Earth that provides land for habitation, soil for agriculture, and stores essential minerals.
Biosphere
The narrow zone of contact where land, water, and air interact, making the existence of all plant and animal life possible.
Important Formulas
Board Exam Info
In the Odisha BSE Class 8 Science examinations, this chapter typically carries around 4 to 6 marks. Common question types include short-answer questions defining the realms of Earth, fill-in-the-blanks regarding gas percentages, and short descriptive questions explaining why Earth is called a unique planet.
Frequently Asked Questions
Why is Earth called a unique planet?
Earth is unique because it has liquid water, a breathable atmosphere rich in oxygen, a suitable temperature range, and a protective ozone layer that together support life.
What are the four major realms of the Earth?
The four major realms are the lithosphere (land), hydrosphere (water), atmosphere (air), and biosphere (living organisms).
What would happen if Earth was closer to the Sun like Venus?
If Earth were closer to the Sun, temperatures would be extremely high, causing all liquid water to evaporate and making life impossible.
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