Mon Prof Augmenté
Dark Needle Mound in the Sun
Age 10 · Physics
Sunlight falls on the dark needle mound and warms the needles packed inside. Opening and closing the round doorways lets warm air move, so the mound holds a steady temperature.
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Age 10: open this week
Browse Age 10
In the picture
- Dark needle surface on the sunny side, where the light lands.
- Round doorway on the sunny slope, standing open, with warm air curling out.
- Round doorway on the shaded slope, filled with a plug of packed needles.
- Air gap between needles inside the mound.
Examples
- A compost heap stays warm inside even on a cold morning.
- A dark stone bench feels hot after the sun has been on it.
Key takeaways
- Dark surfaces soak up sunlight and turn it into heat.
- Opening or closing doorways moves warm air and keeps the temperature steady.
Quiz: Dark Needle Mound in the Sun (Age 10)
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What does sunlight do when it falls on the dark needle mound?
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How do the round doorways help the mound keep a steady temperature?
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What is the purpose of a plug of packed needles in a doorway on the shaded slope?
The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.
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