What planets are made up of rocks?

Answer 1

The planets in our Solar system that are rocky are the inner planets, also called the Terran (earth-like) planets. They are Mercury, Venus, Earth, and Mars.

The outer planets are gas giants, but many of their moons are rocky, as well. Some even have volcanoes.

Answer 2

Mercury - Has a dense iron core that comprises the majority of the planet with a silicate mantle and crust. (Subject to debate: very little iron has been found on Mercury's surface, meaning there would have to be a great deal of differentiation between the core and the rest of the planet)

Venus - Probably has a mostly nickel and iron interior, though this is unproven because of difficulties in collecting data from the planet. This is assumption is based on Venus' similarities to Earth. Its atmosphere is made almost entirely (around 95%) of Carbon Dioxide.

Earth - Composed mostly of iron (roughly 30%, largely concentrated in the core), oxygen (around 30%) and magnesium (around 14%).

Mars - Like the rest of the inner planets, made mostly of iron, with around 16% sulfur in the core and a silicate mantle.

Jupiter - 90% Hydrogen and 10% Helium (75%/25% by weight). It is speculated to have a rocky core, but the pressures that far into the planet prevent testing at this point in time. The main bulk of the planet probably consists of liquid metallic hydrogen

Saturn - Roughly similar percentages to Jupiter, but its interior is hot and gives off more radiation than it receives from the Sun. Why is still open to speculation.

Uranus - atmosphere is 83% hydrogen, but this is only 15% of the planet's total make up. Primarily, it is made of rock and ice (ice usually being a mixture of water, methane and ammonia).

Neptune - Also made up mostly of rock and ice, with only around 15% hydrogen.

Very little is known about Pluto's over all composition -- and it's technically no longer a planet

Answer 3

There are multiple planets made of rock. Those planets are Mercury, Venus, Earth, Mars, and Pluto. There planets are not only made of rock but they are the only planets in our solar system to truly have a base substance of rock.

Answer 4

Mercury is made mostly from iron and rocks with ice assumed to be on the top and bottom of the planet as well. The ice results from the poles not getting as much warmth from the sun. But other than that, Mercury is the planet of rocks.

Work Cited

"The Solar System-The Planet Mercury." Edinformatics. Web. 22 February 2011.

Answer 5

Mercury, Venus, Earth, and Mars are known as the rocky planets in our solar system. They are composed predominantly of rock and metal materials, with solid surfaces and relatively thin atmospheres compared to the gas giants.

Answer 6

Mars has rocks and metals. Or you could say it is made up of rocks and metals.

Answer 7

Mercury Pluto

Answer 8

the inner planets

Answer 9

Pluto