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Our Home: Earth, a Unique Life Sustaining Planet

Start here

Draw Earth as a circle. Now add the thin layer where life lives: land, water and air. It is thinner than your pencil line.

All life lives on a very thin layer. If Earth were an apple, this layer would be its skin.

This is Chapter 13, Our Home: Earth, a Unique Life Sustaining Planet.

What you will learn

  • Distance: why water stays liquid on Earth.
  • Air: gravity holds it, and ozone blocks harmful rays.
  • Water and soil: the hydrosphere and the geosphere.
  • The neighbours: Mercury, Venus and Mars compared with Earth.
  • Keeping life safe: what life needs, and what harms it.
  • One parent or two: how living things make more of their kind.
  • Flower to seed: how pollen and gametes make a seed.

Need a quick recap?

  • The solar system: eight planets go round the Sun.
  • Soil: plants grow in it.

Stay safe

Never look at the Sun. Never look at it through any lens, mirror or glass.

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This track

  1. 0 Start here
  2. 1 A place in the middle
  3. 2 The blanket of air
  4. 3 Water everywhere
  5. 4 The thin layer on top
  6. 5 The neighbours
  7. 6 Several at once, not one
  8. 7 Checkpoint
  9. 8 Looking after Earth
  10. 9 One parent or two
  11. 10 From flower to seed
  12. 11 The big picture
  13. 12 Track quiz

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