The first hint to crack the puzzle "This gas makes up around 78% of Earth's atmosphere" is:

It is a word which contains 8 letters

The second hint to crack the puzzle "This gas makes up around 78% of Earth's atmosphere" is:

It starts with letter n

The third hint to crack the puzzle "This gas makes up around 78% of Earth's atmosphere" is:

It ends with letter n

Looking for extra hints for the puzzle "This gas makes up around 78% of Earth's atmosphere"

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The answer for the puzzle "This gas makes up around 78% of Earth's atmosphere" is: