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Ari Raider's Training Materials · Treasure Mountain · Training Center 2 of 6
Rock Layers & Relative Age
The Sandstone Stair is built from rock layers — and it only holds if you stack them the way the Earth did.
What you're training for
At the Sandstone Stair, three layers have been shaken loose and lie jumbled at the bottom of the staircase. Rebuild them in the order the Earth laid them down and the stair takes weight again. Train here first; prove it in the simulation.
The science
- Sedimentary rock builds up in layers, each one settling on top of the last.
- Superposition: in undisturbed layers, the oldest is always at the bottom — it got there first — and the newest is on top.
- Each layer records the environment it settled in: desert sand, river mud, seafloor shells.
- Geologists read a cliff face like a story, from the bottom of the page up.
Teach it today — no prep
The strata sandwich. Build a "cliff" in front of the class — bread, jam, crumbs, more bread — then slice it and ask which layer went down first and how they know. Swap in stacked colored paper if food is off the table; each sheet is a year, a flood, a beach.
Trained and ready? Prove it at Stop 2 — the Sandstone Stair. Free, no logins, progress saved on the device.
Enter the Realm at Stop 2Resources 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 Treasure Mountain 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 Treasure Mountain training
Rock Families · Rock Layers · Rock Cycle · Mineral Properties · Mohs Hardness · Crystals & Glow · Enter the Adventure →