Mon Prof Augmenté
Counting a Seaweed’s Floats
Age 9 · Nature
This seaweed grows one new gas-filled float every year, so its floats line up in a row along the flat strap. Count the floats and you know how many years the seaweed has been growing.
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Age 9: open this week
Browse Age 9
In the picture
- The widest float, at the base of the frond
- The smallest float, near the tip of the frond
- The split-open float in the puddle, letting out bubbles
Examples
- Counting the rings inside a cut tree trunk to find its age
- Counting the candles on a birthday cake to see how old someone is
Key takeaways
- One new float grows on the frond each year
- The number of floats is the seaweed’s age in years
Quiz: Counting a Seaweed’s Floats (Age 9)
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What can you find out by counting a seaweed’s gas-filled floats?
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You find one of these seaweeds with seven floats along its strap. About how old is it?
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If this seaweed keeps growing for one more year, what will happen to its floats?
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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