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Mercury is a rocky planet.
It's actually a rock because it is one of the inner planets that are all made of rock.

The planet Mercury is a dense, rocky, airless world.

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12y ago
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8y ago

Mercury is mostly made of rock.

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12y ago

Mercury is a rocky planet.

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12y ago

Rock

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9y ago

gas.

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Q: Is Planet Mercury made mostly of gas or rock?
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