The Earth and Space
Soil · Inside the earth · The solar system
What soil is made of and what its layers are
Erosion, deposition and ways to save soil
The inside of the earth and how it moves
The change of seasons and the members of the solar system
Pieces of rock: dust, sand and small stones
Organic matter and the humus formed by rotting
Water, which shows itself as vapour on heating
Air, which comes out as bubbles when soil is put in water
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