We wanted to find out the average cost to replace a roof in the UK so we assume the following when we contacted our chosen companies: 1  A detached house with a simple âup and overâ roof design. 2  Approximately 64 square metres.e wanted to find out the average cost to replace a roof in the UK so we assume the following when we contacted our chosen companies: 1  A detached house with a simple âup and overâ roof design. 2  Approximately 64 square metres.
Jovian Planet Characteristics. Jupiter, Saturn, Uranus and Neptune are the four jovian planets of the solar system. The density of these planets is less than that of the earth, as they are mainly formed of hydrogen along with helium and compounds of hydrogen such as methane and ammonia. The mass of these planets is more than 10 times that of the Earth. 2  They have very small cores as compared to the terrestrial planets. 3  Gas storms are a common phenomena on the surface of the jovian planets.
Best Answer: Jovian planets (the gas giants) have no common composition; the four in our solar system can be split into two groups.Jupiter and Saturn are primarily hydrogen and helium, while Neptune and Uranus are water, ammonia, and methane. This is why Jupiter/Saturn are colored differently from Neptune/Uranus.The terrestrial planets have in common a metallic, mostly iron, core, surrounded by a mantle of liquid silicates, outside of which is a crust.his is why Jupiter/Saturn are colored differently from Neptune/Uranus. The terrestrial planets have in common a metallic, mostly iron, core, surrounded by a mantle of liquid silicates, outside of which is a crust.