16. What is a volcanic tremor?
17. Which of the following is a shield volcano?
18. What is a volcanic vent?
19. What is a volcanic bomb?
20. What is a lava tube?
21. What is a volcanic avalanche?
22. What is a volcanic plume?
23. What is a volcanic fissure?
24. How does volcanic activity contribute to the Earth's atmosphere?
25. What is the most common gas emitted during volcanic eruptions?
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