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View compareClean Water & Natural Filters Training Center
Ari Raider's Training Materials · Wild Earth Expedition · Training Center 3 of 6
Clean Water & Natural Filters
The Clear Spring is running brown, fed by bare ground upstream. Water that soaks in comes out clean; water that runs across the top brings the dirt with it.
What you're training for
At the Clear Spring, the bottom of the pool has vanished under brown. It clears for whoever can sort where rain soaks in from where it runs off. Train here first; prove it in the simulation.
The science
- Rain that soaks into the ground gets filtered by the soil — layer after layer of natural strainer — and comes out of springs clear.
- Rain that runs across a hard surface — parking lots, rooftops, packed paths — picks up loose dirt and carries it straight into the water.
- Forest floors, meadows and loose soil are the great soaker-inners; pavement is the great runner-offer.
- This is why springs in forests run clear and ditches by roads run brown — the ground upstream decides the water downstream.
Teach it today — two cups and some soil
The soil filter. Two funnels over clear cups: one holds a coffee filter packed with soil, one is empty. Pour the same muddy water through both. The soil-filtered cup drips out visibly cleaner — the ground just cleaned the water, in front of the class. Then sort surface cards: soaks in, or runs off?
Trained and ready? Prove it at Stop 3 — the Clear Spring. Free, no logins, progress saved on the device.
Enter the Realm at Stop 3Resources in this training center
Worksheets, reading passages, flashcards and printables for this lesson are being added — new resources land here first. Get one email a month when they do, or browse the whole free library.
The hands-on half: the Wild Earth Expedition Adventure Kit puts six real specimens, six Digs, six Gemlings and the Realm map in your students' hands — $19.99, or $15 a student for classrooms.
More Wild Earth Expedition training
Parts of a Plant · Plants & Erosion · Clean Water · Energy from the Sun · Renewable Energy · Protecting Habitats · Enter the Adventure →