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Science Bowl Question

📅 NSB Middle School 2009🎓 MS🔄 Round 8#️⃣ Question 11❓ TOSS-UP📝 Multiple Choice

Which of the following best describes how volcanic glass or obsidian is formed:

W) magma cools rapidly and crystals do not form
X) magma cools slowly and 1 large crystal is formed
Y) magma cools in direct contact with water
Z) magma is heated, cooled, then reheated
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