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Science Bowl Question

📅 NSB MS 2014🎓 MS🔄 Round 11#️⃣ Question 20🌟 BONUS📝 Multiple Choice

Why are old documents preserved by sealing them in containers filled with helium?

W) Helium will react with any poisonous gas that enter the container and prevent the gas from harming the document
X) Helium is inexpensive and easy to find
Y) Helium is a gas that will not react with any other element including the paper of the document
Z) Helium will brighten the print on the document
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