Terrestrial planet Terrestrial planet A terrestrial planet, telluric planet, or rocky planet is a planet that is composed primarily of silicate rocks or metals. Within the Solar System, the terrestrial planets are the inner planets closest to the Sun, i.e. Mercury, Venus, Earth, and Mars. The terms "terrestrial planet" and "telluric planet" are derived from Latin words for Earth ("Terra" and "Tellus"), as these planets are, in terms of structure, "Earth-like". Terrestrial planets have a solid planetary surface, making them substantially different from the larger giant planets, which are composed mostly of some combination of hydrogen, helium, and water existing in various
Saving Planet Earth which we live. Our life will be waste if we have no any goal. Without any goal we will feel unlucky, waste life etc. But if we don't Save Planet Earth then, our Earth will be destroyed and we can't live. So, Save Planet Earth. In the first of nine 30-minute films focussing on particular threatened species, pop star Will Young travels to Cameroon to report on the plight of the lowland gorilla. Although more numerous than its mountain-dwelling cousins, its numbers are declining fast due to habitat loss and poaching. Tigers have been a protected species for many years,