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.

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.