is considered as a valuable because it is a rare element.
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Chemistry, 21.06.2019 15:30
Arock can be broken down into different kinds of substances by physical processes. no chemical reactions are needed to separate different parts of a rock into pure substances. this is because a rock is a(n)
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Mathematics, 23.02.2021 01:00
Mathematics, 23.02.2021 01:00
Mathematics, 23.02.2021 01:00
Mathematics, 23.02.2021 01:00
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