A town can sit on top of enough copper to supply a country while a town 200 miles away has almost none. This 45-60 minute phenomenon lesson hands students five real U.S. resource sites and asks them to figure out why.

No invented scenarios. Students analyze five actual sites - copper at Morenci, Arizona; coal in southern West Virginia; oil and gas in the Permian Basin, Texas; groundwater in the Nebraska High Plains; and geothermal energy at The Geysers, California - all described from public-domain USGS and U.S. Energy Information Administration sources.

The data table gives students only what scientists FIND in the ground. The formation story is deliberately left out, because that story is the answer. Students have to infer the mechanism themselves instead of copying it off the page.

The five sites are chosen so the pattern isn't trivial. Two formed from things that were once alive, two are tied to Earth's heat, and groundwater fits neither. That pushes students past "alive or hot" to the real generalization the standard asks for: a resource is where it is because a specific past process happened in that specific place.

1. Notice and wonder about the phenomenon

2. Analyze a five-site data table and underline the clues

3. Find the pattern across the sites

4. Sort six statements into observation vs. explanation

5. Build a labeled cause-and-effect model

6. Write a claim, evidence, and reasoning explanation

7. Exit ticket: one question they still have

- 4 print-ready student pages (letter size, black and white)

- 4-page teacher guide

- Complete answer key with formative look-fors

- Minute-by-minute facilitation sequence

- Anticipated student ideas and response moves

- Quick rubric for the model and the CER

- Full NGSS three-dimensional alignment

- Source and rights documentation

NGSS MS-ESS3-1 - Construct a scientific explanation based on evidence for how the uneven distributions of Earth's mineral, energy, and groundwater resources are the result of past and current geoscience processes.

- DCI: ESS3.A Natural Resources

- SEP: Constructing Explanations and Designing Solutions

- CCC: Cause and Effect

This is designed as a phenomenon launch, not a summative assessment of MS-ESS3-1. Students build a deliberately incomplete first model that they return to and revise as the unit continues, and the teacher guide explains how to run it that way. If you are looking for an end-of-unit assessment, this is the lesson that sets one up rather than the one that closes it.

Prints at 100% scale on letter paper, double-sided, 2 sheets per student. Fully usable in black and white - no color printing needed. Zero prep: print and teach. No student devices required.