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Science Bowl Question

📅 NSB Regional 2016🎓 HS🔄 Round 7#️⃣ Question 8❓ TOSS-UP📝 Multiple Choice

Which of the following procedures is NOT commonly used during drilling to recover more oil from the ground?

W) Filling the well with water
X) Pumping nitrogen or carbon dioxide into the well
Y) Injecting polymers into the well
Z) Creating a vacuum in the well
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