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love history [14]
3 years ago
5

Blimps were once filled with hydrogen, but now helium is used

Biology
1 answer:
rusak2 [61]3 years ago
6 0

Answer:

C.

Explanation:

Hydrogen's pure form is gas at room temperature. Helium is expensive. Hydrogen is lighter than helium.

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d. The sun is stationary and the moon is moving.

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Hope it helps.

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Hope that helps! :)
5 0
3 years ago
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