If the same amount of matter exists before and after changing, then is Earth like a closed ecosystem? Does is it contain a specific amount of matter until an outside source adds more matter into it?

Question

If the same amount of matter exists before and after changing, then is Earth like a closed ecosystem? Does is it contain a specific amount of matter until an outside source adds more matter into it?

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Answer 1

depending on how precise(theoretical) you want to get either yes or very very VERY slowly decreasing(maybe).

https://physics.stackexchange.com/questions/16351/mass-converted-to-energy-in-a-common-fire

ELI5 yes that is exactly right we are part of earth and will return to become the next generation of earthlings like the dinosaurs and germs before us, while drinking the same water as them. That is until we rocket into space and we lose those atoms forever until some asteroids can come and add some spice to the mix.