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Katyanochek1 [597]
3 years ago
6

Which best explains why a wood-burning fireplace does not represent a closed system? A. because a fire requires oxygen from the

atmosphere to burn B. because the ashes have to be swept away C. because they are not all made of brick D. because they can be used for cooking
Physics
1 answer:
sweet [91]3 years ago
7 0
Answer is A of course lol Fire needs oxygen as an essential fuel to burn.
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If a hot air balloon has shown rising above the top of a hill, the top of the hill is considered as a reference point.

<h2>Reference Point:</h2>

It is a point that is used to standardize a experiment. The reference point is a constant point.

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