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What is karst?

a kind of physical decomposition

a kind of chemical decomposition

a kind of biological decomposition

none of the above

Karst is a topography formed from the dissolution of soluble rocks such as limestone, dolomite, and gypsum. It is characterized by underground drainage systems with sinkholes and caves. It has also been documented for more weathering-resistant rocks, such as quartzite, given the right conditions.

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What's the origin of the word "turquoise"?

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What is the largest known diamond in the world?

Which of this mineral is the best diamond alternative?

strontium titanate

Which of those astronomers was also a brewer?

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Aleksander Wolszczan

Johannes Hevelius