What is Mercury made out of rock or gas?

Answer 1

Mostly rock and metals -

MERCURY - Astronomers have estimated that the Mercury composition is made up of approximately 70% metals and 30% silicate material. In fact, it's only slightly less dense than the Earth, with 5.43 g/cm3. Since Mercury is smaller than Earth, its gravity doesn't compress it down as much, so it actually has much more heavier elements inside it. Geologists estimate that its core is very large, and mostly iron. The core probably accounts to 42% of Mercury's volume, while Earth is just 17%.

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Answer 2

The planet Mercury is a small, hot planet made of rock with little or no atmosphere.

Answer 3

Rock. Mercury is one of the four inner rocky planets.

Answer 4

It is made of Rock.

Answer 5

rock