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This chapter explains why Earth is a unique planet that supports life, how life is sustained and continued, and what threatens it today.
Understanding the Name of the Chapter
Our
It belongs to all of us living beings.
Home
The one place where we live and survive.
Earth
Our planet, third from the Sun.
Unique
Special and unlike any other known planet.
Life
Plants, animals and humans that live here.
Sustaining
It keeps life going over a long time.
Planet
A large body that orbits the Sun.
What does the name of this chapter tell us?
- Earth is our home, the only planet known to have life.
- It has special conditions that no other planet has.
- It does not just allow life — it keeps life going.
Topics We Will Study in This Chapter
Topics We Will Study
Intro
Introduction
13.1
Why Is Earth a Unique Planet?
13.2
What Do the Planets of Our Solar System Look Like?
13.3
What Makes the Earth Suitable for Life to Exist?
13.4
What Allows Life to Be Sustained on Earth?
13.4.1
Air, water, and sunlight
13.4.2
Soil, rocks, and minerals
13.4.3
Plants, animals, and microorganisms
13.4.4
The importance of balance
13.5
What Keeps Life from Disappearing?
13.6
What Are the Threats to Life on Earth?
