Turn your students into science detectives with this NO PREP, engaging, real-world investigation focused on what protects Earth from harmful radiation. In this case file activity, students analyze UV radiation data, examine ozone concentration trends, evaluate atmospheric chemistry evidence, track human impact patterns, rank possible causes, and build a scientific case to solve the mystery of how the ozone layer protects life on Earth.

Instead of passively reading about the atmosphere and ultraviolet radiation, students actively investigate, analyze patterns, and reason through the evidence to uncover how ozone (O₃) in the stratosphere absorbs harmful UV-B radiation and how human-made chemicals have affected this protective layer. This activity makes atmospheric chemistry interactive and easy to understand while strengthening critical thinking and literacy skills.

✅ NO PREP, no formatting, no issues. Simply download and go. Includes all instructions, answer key, rubric, and background reading students need to solve the case. This mystery is included inside my Chemistry in Everyday Life Mystery Activity Bundle.

10-Part Activity Breakdown

Part 1 – Mission Briefing: Students are introduced to a case involving increased UV exposure, ozone concentration changes, and environmental health concerns.

Part 2 – Background Reading: Students build foundational knowledge about the ozone layer, the stratosphere, ultraviolet radiation, ozone (O₃) molecules, and how chlorofluorocarbons (CFCs) affect atmospheric chemistry

Part 3 – Evidence Log: Students examine 10 detailed evidence cards related to UV-B measurements, stratospheric ozone levels, CFC release patterns, satellite data trends, health impacts, and environmental protection policies.

Part 4 – Suspect Ranking: Students rank possible causes of ozone depletion (CFCs, natural weather patterns, solar radiation changes, industrial emissions, atmospheric circulation) and justify their reasoning using scientific evidence.

Part 5 – Pathway Tracking: Students trace how human-made chemicals travel to the stratosphere → break down ozone molecules → allow more UV radiation to reach Earth’s surface.

Part 6 – Impact Analysis: Students analyze how ozone depletion affects radiation exposure, ecosystems, and human health.

Part 7 – The Big Question: Students explain what protects Earth from harmful radiation and how that protection can be disrupted.

Part 8 – CER Writing: Students construct a scientific argument using Claim–Evidence–Reasoning.

Part 9 – Solutions & Action Plan: Students propose environmental and policy-based solutions to protect the ozone layer.

Part 10 – Reflection: Students reflect on how atmospheric chemistry connects to global environmental protection efforts.

What Students Will Learn

• What the ozone layer is and where it is located
• What ultraviolet (UV-B) radiation is
• How ozone absorbs harmful radiation
• How CFCs release chlorine in the stratosphere
• How chlorine breaks down ozone molecules
• Why ozone depletion increases UV exposure
• How environmental regulations protect the ozone layer
• How to use Claim–Evidence–Reasoning (CER) to support scientific explanations
• How atmospheric chemistry affects life on Earth

This activity blends chemistry, environmental science, Earth science, critical thinking, and literacy skills into one high-interest, structured lesson that keeps students thinking like real-world chemical investigators.

This Mystery Is Perfect for:

• Chemistry in Everyday Life units
• Chemical reactions lessons
• Law of Conservation of Mass lessons
• Physical vs chemical change review
• Physical science classes
• Sub plans, review days, or project-based learning

No prep, no formatting, no issues.

Simply download, print (or upload to your class site) and you're all set.

What’s Included

• A complete student case file with guided worksheets for every step of the investigation
• 10 detailed evidence cards based on real-world chemistry issues --> Evidence cards include two versions: one with images and one without images
• A full teacher answer key with sample responses and grading support
• A full marking rubric that covers all key aspects of the mystery activity

Why Teachers Love This Resource

• Fully structured and print-and-go – Everything is ready to use with clear directions and built-in scaffolding
• High engagement without extra classroom management – The detective format naturally hooks students
• Real-world relevance students immediately understand
• Builds both science and ELA skills – Includes analysis, explanation, and CER writing
• Flexible for any schedule – Use in one class period, over two days, or as a mini-project

Time Required

• 2 class periods
• Can be extended into a 3-day mini-project

The following Mystery Activities can be found inside my Chemistry in Everyday Life Mystery Activity Bundle.

1. The Acid Rain Mystery
2. The Household Cleaning Products Reaction Mystery
3. The Conductivity Case Mystery
4. The Energy Release Mystery
5. The Phase Change Puzzle Mystery
6. The Missing Mass Mystery
7. The Ozone Layer Mystery
8. The Plastic Breakdown Mystery
9. The Solubility Surprise Mystery
10. The Spoiled Food Mystery

Google Classroom and Distance Learning Ready

• This resource is perfect for in-class or distance learning and integrates seamlessly with Google Classroom.
• It automatically creates a copy of the reading and places it directly into your Google Drive with a single click.
• Purchase → Open → Click → Assign to your students
• The reading also includes a Microsoft Word and PDF version.
• Having all three options allows you to assign the activity without worrying about formatting issues, and ensures access for all students regardless of device or learning environment.

No prep, no formatting, no issues. Simply download, print (or upload), and you're all set.

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If you have any questions please feel free to send me an email - devon@teachwithfergy.com