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Science Bowl Question

📅 NSB 2015🎓 MS🔄 Round 16A#️⃣ Question 11🌟 Bonus📝 Multiple Choice

Over the Earth's history, ice ages have occurred approximately how often?

W) Every 2 million years
X) Every 20 million years
Y) Every 200 million years
Z) Every 2 billion years
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