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Run it in class
How do collision history and source shape sand grains?
Show of hands — before you project anything
Predict first: do you think sand was always tiny, or was it once big rock? How could the SHAPE of a grain help us tell?
- A Way more than you'd guess
- B About what you'd guess
- C Way less than you'd guess
Count the votes out loud. Hold them to it — then watch.
Project it (fullscreen)
Discussion prompts
- Predict first: do you think sand was always tiny, or was it once big rock? How could the SHAPE of a grain help us tell?
- Predict first: send a soft rock and a hard rock down the same river — which one turns into sand faster, and why?
- Some beaches are white, pink, or even black. Predict what got smashed up to make each color before you look it up.
Where it shows up in real life
- Rounded, smooth grains in beach or river sand, versus the sharp edges of crushed gravel
- A pebbly mountain stream where rocks are bigger and more jagged than at the river's mouth
- A white tropical beach made largely of crushed coral and shells instead of rock
A prediction-first worksheet — no answer key.
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Explore every question
How do collision history and source shape sand grains?
Predict — what do you think will happen, and why?
Talk about it
- Predict first: do you think sand was always tiny, or was it once big rock? How could the SHAPE of a grain help us tell?
- Predict first: send a soft rock and a hard rock down the same river — which one turns into sand faster, and why?
- Some beaches are white, pink, or even black. Predict what got smashed up to make each color before you look it up.