Concept Map — Chapter 13

Last updated at July 13, 2026 by

💡 Tap any box to read it. The map shows how the chapter's ideas connect.
Our Home: Earth Chapter 13 · A unique life-sustaining planet A Unique Planet 13.1 – 13.2 Suitable for Life 13.3 Life Sustained 13.4 – 13.5 Threats to Life 13.6 Thin Crust where life exists Solar System greenhouse effect Blue Planet covered in water Position & Size habitable zone Magnetic Field a protective shield Four Spheres air, water, land, life Reproduction asexual & sexual Balance of Nature all connected Triple Crisis climate, loss, pollution Protect Earth clean energy
Our Home: Earth
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13.1–13.2 A Unique Planet
Why Earth and its neighbours differ
Thin Crust
All life lives on the surface layer
Solar System
Eight planets; greenhouse effect
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Blue Planet
Earth is covered in water
13.3 Suitable for Life
What makes Earth habitable
Position & Size
Habitable zone, holds atmosphere
Magnetic Field
Shields Earth from space particles
13.4–13.5 Life Sustained
How life is supported and continued
Four Spheres
Air, water, land and life connect
Reproduction
Asexual and sexual keep life going
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Balance of Nature
Everything is connected
13.6 Threats to Life
What endangers our planet
Triple Crisis
Climate change, loss, pollution
Protect Earth
Clean energy and small actions
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