The earth planet

                                                                 The Earth Planet

A rocky planet, also known as a terrestrial planet, terrestrial planet, or solid planet, is a planet composed primarily of silicates. Rocky planets are substantially different from gaseous planets, which have a secondary or nonexistent solid surface and are composed primarily of gases such as hydrogen, helium, and water, in various states of aggregation. All terrestrial planets have roughly the same structure: a metallic, mostly iron core and a surrounding silicate mantle. The Moon has a similar composition, except for its iron core. Terrestrial planets have canyons, craters, mountains, and volcanoes. They also have secondary atmospheres, derived from their internal geological processes, unlike the gas giants, which have primary atmospheres captured directly from the original solar nebula.