🧠 Interactive Fill in the Blanks Type your answers in the large boxes below! 1. The Earth is surrounded by an envelope of air called the . 2. Air contains approximately % Nitrogen. 3. In the lab, is used to prove the presence of Carbon dioxide. 4. The process of burning fuel in the presence of oxygen is called . 5. CNG mostly consists of gas. 6. When fuel burns, it reacts with oxygen to form Carbon dioxide and . 7. The gas that turns white anhydrous copper sulphate to blue is . 8. A fire is extinguished if the supply of (or oxygen) is cut off. Check My Answers
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