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Twisted Sifter on MSN
2 天
Minerals, Crystals, And Gemstones. What Are They And What Are The Differences Between Them?
Most people know some very basic information about minerals, crystals, and gemstones, but likely wouldn’t be sure about what ...
PBS
2 年
What's at the Center of the Earth? Troglobites!/Minerals!
Well, first of all, topaz isn't a rock. It's a mineral. - Maybe minerals hit each other really hard and join together. - That's an interesting hypothesis, Don. - Let's test my hypothesis.
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