Natural abundance of oxygen I think
Answer:
potential energy and kinetic energy
This has been an ongoing debate between scientists and astrologers. It is actually classified as a dwarf planet.
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~Brooke
With a physical change you can actually see it change like ice turning into water, then with a chemical change you can't see it change, although within the molecules themselves they change which makes that possible.
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The textbook would lose potential energy since its falling from a high height.