Mon Prof Augmenté
The Layers Under Our Feet
Age 11 · Geography
Open to everyone until Thursday, October 29
To keep it, print it while it is open.
Over a very long time, rain, ice and plant roots break solid rock into smaller and smaller pieces, and these pieces mix with rotted leaves to make soil. If you dig down, you find soil in layers, with dark living soil at the top and hard rock at the bottom.
In the picture
- Topsoil: dark, crumbly soil full of roots, worms and rotted leaves
- Subsoil: reddish-brown soil with less life and minerals washed down from above
- Broken rock: loose chunks of rock cracking off the bedrock
- Bedrock: solid rock that slowly weathers into new soil
Examples
- A garden bed where a spade turns up dark, wormy topsoil
- A road cutting where you can see the soil layers above grey rock
Key takeaways
- Soil forms when weathering breaks rock down and it mixes with dead plants
- Soil gets darker and richer toward the top and rockier toward the bottom
Quiz: The Layers Under Our Feet (Age 11)
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What two things mix together to make soil?
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As you dig deeper down from the surface, how does the soil change?
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Where do the minerals in the subsoil come from?
The answers, each with its explanation, are in the app. This quiz is free there while the lesson is in the free week.
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