Coral Reefs
Reading Mystery Worksheets · Grades 3–6 · Ocean Ecosystems & Bleaching
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Inside the case file
On Friday the tank was gold and brown and green; this morning every colony in it is bone white — and working out why means understanding what a coral actually is. Students read a nonfiction passage on reefs, answer fifteen comprehension questions from the text, and cross a suspect off the line-up with every correct answer. Printable, self-checking and no prep, it drops straight into an ocean, ecosystems or marine science unit for Grades 3–6.
Quick Details
Skill: Nonfiction comprehension, text evidence and science content knowledge · Grades: 3–6 · Format: One case — two-page informational passage, 15 multiple-choice questions, written response and full answer keys (printable PDF, color and black-and-white) · Theme: Coral Reefs
The Case
The Blue Harbor Aquarium has spent two years growing the reef in its biggest tank. Staff call it the reef room, and the coral in it came from fragments raised in the aquarium's own nursery. On Friday it was gold and brown and green. This morning every colony in that tank is bone white. Nothing is missing and nothing is broken — the coral is all still there, and it is not the same coral. Something in that room was changed overnight, and the change is still doing its work. There are sixteen suspects, and the clues are hidden inside the facts.
What the Passage Covers
That a reef is not a rock and not a plant but millions of animals living side by side, each smaller than a pencil eraser. What a polyp is — the soft tube-shaped body, the mouth, the ring of stinging tentacles that reach out at night, and the hard calcium carbonate cup it builds around itself. Then the algae that live inside the polyp and give a reef its color, what happens when the water warms, why bleaching turns a reef white, and why reefs matter to the ocean and to people.
How the Reading Mystery Works
Students take on the role of Reading Detectives. They read the passage, answer each multiple-choice question from the text, and cross off the suspect shown beneath the correct answer. Work through all fifteen and the final name remaining is the culprit — the science is not decoration around the puzzle, it is how the puzzle is solved.
What's Included
- A "You are a detective" case-file page that sets the scene and the mission
- A two-page nonfiction passage on coral polyps, reef ecosystems and bleaching
- Three pages of multiple-choice comprehension questions, every answer found in the text
- A sixteen-suspect line-up page for eliminating names one clue at a time
- Written-response pages with sample answers
- A themed word search and extension activities for early finishers
- Self-checking answer keys for every page
- Full color and ink-saving black-and-white versions
- Teacher instructions and print-and-go PDF format
Skills Covered
- Reading and understanding nonfiction informational text
- Finding and citing text evidence
- Main idea, supporting details and cause and effect in science writing
- Coral polyps, reef ecosystems, symbiosis and coral bleaching
- Science vocabulary in context
- Logical reasoning and deductive elimination as suspects are ruled out
Best Used For
- Ocean, marine life and ecosystems units
- Earth science, conservation and climate lessons
- Nonfiction comprehension practice
- Reading and science centers, early finishers and sub plans
- Small groups, intervention and homeschool
- Review and test prep for Grades 3–6
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