What fundamental property prevents Earth from indefinitely retaining its helium supply?

Answer

Its atomic structure makes it chemically inert and incredibly light, allowing it to drift into space.

Helium is a noble gas, meaning it is chemically inert and does not bond easily. Being very light, the Earth's gravity is insufficient to hold it once it enters the atmosphere, causing it to float away into space.

What fundamental property prevents Earth from indefinitely retaining its helium supply?

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The world will run out of helium, but this could fix it - YouTube

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