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The only statement actually listed is not correct, at least not always. (We're really not ideally set up here for multiple choice questions.)

the answer is: Stalagmites are coned-shaped deposits.

D is correct. Stalagmites are cone-shaped deposits.

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As a general rule C is wrong, certainly in limestone; but Iranian cavers recently discovered a beautiful cave formed entirely by dissolution of the salt in a massive rock-salt bed; and this contains really lovely salt-crystal formations!

A more common exception is gypsum - calcium sulphate - which often appears as lovely, fine porcupine quill-like elongated crystals, on the clay which it is its mineral source.

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