This would refer to the outer planets; the gas giants. In other words, Jupiter, Saturn, Uranus and Neptune.
Of the 8 planets, four are rocky and four are gas planets, so there are equal numbers.
4 rocky planets
Terrestrial Planets, or Rocky Planets.
the gas planets are bigger than the rocky planets
Mercury is a rocky planet. The inner planets (first four planets from the sun) are rocky planets (which means that you could stand on them) and are the smallest. While the outer planets (last four planets from the sun) are gas planets and the biggest.
rocky
they are rocky and have terrain areas the rest of the planets are all gas
There are 5 rocky planets in our solar system if you count Pluto. If not, there are 4 rocky planets in the solar system.
The four inner planets are also known as the terrestrial planets (or the `rocky` planets). These are; Mercury, Venus, Earth and Mars.
The inner rocky planets are; Mercury, Venus, Earth and Mars. They are also known as the terrestrial planets.
The Rocky planets are Mercury, Venus, Earth and Mars. They are all the planets with a solid surface made of rock.
The rocky planets are(in order)... Mercury, Venus and of course, Mars