[Answer] 5. What is the most common hydrogen compound on Earth?

Step 1 : Introduction to the question "5. What is the most common hydrogen compound on Earth?"

...1. Air 2. Natural gas 3. Sand 4. Water Water (H2O) covers over 70% of the earth's surface and comprises nearly 85% of our bodies. Without it no life would have been possible.

Step 2 : Answer to the question "5. What is the most common hydrogen compound on Earth?"

Water:

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