Here's the solution to the worksheet, with a clear explanation:
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✔ Correct Answers (Check these boxes):
✔️
Active volcanoes erupted in the past and can erupt again.
✔️
Dormant volcanoes are sleeping but they are dangerous too.
✔️
Extinct volcanoes cannot erupt again.
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✘ Incorrect / Irrelevant Sentences (Do NOT check these):
⬜ There are a lot of volcanoes on Mars.
→ This talks about *Mars*, not *Earth*, which is the focus of the main idea.
⬜ I have a volcano poster in my room.
→ This is a personal fact and has nothing to do with types of volcanoes on Earth.
⬜ I want to become a volcanologist.
→ This is about a future career goal — not a supporting detail about volcano types.
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📚 Explanation:
The
main idea is:
> *“There are active, dormant and extinct volcanoes on Earth.”*
Supporting details must give more information *about* those three types of volcanoes *on Earth*. They should help explain what each type is or how they behave.
- The sentence about
active volcanoes explains that they’ve erupted before and can erupt again → supports the idea.
- The sentence about
dormant volcanoes says they’re “sleeping” but still dangerous → adds detail about their nature.
- The sentence about
extinct volcanoes says they can’t erupt again → clearly defines them.
The other sentences are off-topic:
- Mars is not Earth.
- A poster or career goal doesn’t explain volcano types.
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✔ So, you should check only the 3 correct boxes as shown above.
Let me know if you’d like this turned into a printable answer key! 🌋
Parent Tip: Review the logic above to help your child master the concept of main idea worksheets 3rd grade.
