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Two crystalline materials together: kyanite (blue) embedded in quartz (white). Photo 12/Universal Images Group via Getty Images

How do crystals form?

There are a lot of myths about crystals − for example, that they are magical rocks with healing powers. An earth scientist explains some of their amazing true science.
Perspective view of a lobate scarp on Mercury named Carnegie Rupes, colour-coded according to surface altitude. The crater near the middle is nearly 40 km across. NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington

Mercury: shrinking planet is still getting smaller – new research

Mercury has shrunk by7 km. Most of this happened long ago, but now we have evidence that it continues.
The Jharia coal field in India has been on fire underground since 1916. Jonas Gratzer/LightRocket via Getty Images

Why don’t rocks burn?

Some rocks will burn, and others will melt, depending on how they were formed and what minerals they contain.

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