Episode guide
Where Does Sand Come From?
A handful of beach is a handful of tiny journeys. This episode follows the grains backward, up the rivers and into the mountains, and finds out how long some of them have been travelling to arrive under your feet.
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11:25
Sleep timer
The science, gently
- Scientists sort sand by size rather than by what it is made of: too big to be dust, too small to be a pebble. A beach is whatever the world had nearby, broken down small enough, and delivered.
- Quartz is the traveler that survives. Most minerals dissolve or crumble on the way down a river, so a pale beach is largely the part that would not break.
- On one reef in the Maldives, scientists found that more than eight of every ten grains of new sand had come from parrotfish, which scrape coral with their beaks and let the rest go.
Wonder together
- How far do you think the grain in your hand travelled before it arrived here?
- Some grains are millions of years old and some were made last summer. How would you tell them apart?
- If a mountain can slowly become a beach, what do you think a beach becomes next?
Tonight's calm-down
A mountain does not hurry to become a beach. It takes millions of years, and not one grain of it is ever late. Nothing you are carrying tonight has to be finished tonight either. Let the day come apart slowly, the way stone does, and let the pieces settle wherever they land.
Go further together
There's so much more to explore.
The episode is a whole story on its own. But if the wondering keeps going after the audio ends, the Family Guide opens this one all the way up: the same calm voice, turned into something you can do together at the table the next morning.
- Questions written for your child's age, not just their reading level
- One hands-on experiment, simple enough for tonight
- The science words behind it, in plain language
- A printable to color, keep, or fill in
Two versions inside: one for ages 4–6, one for ages 7–10.
Free to read while the library grows.