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Description
The plot of the first Equestria Girls resolved instantly by someone from another movie. The crown is metal. Magneto controls metal. Do the math.
Still irrelevant.
And gold can still be dissolved in aqua regia.
That’s relevant how? The crown is solid enough, so it’s probaly made out of gold.
And some of them wouldn’t even be solid out on a sunny day. Mercury is liquid at STP (100000 Pa, 273.15 K), and a few (cesium, rubidium, gallium) also have fairly low melting points. Wikipedia lists the melting point of cesium at 28.5 °C, rubidium at 39.30 °C, and gallium at 29.7646 °C.