Terrestrial planets

 Terrestrial planets have approximately the same type of structure: a central metallic core, with a surrounding rocks. Terrestrial planets can have canyons, craters, mountains, volcanoes, and other surface structures, depending on the presence of water and tectonic activity. Terrestrial planets have secondary atmospheres, generated through volcanism or comet impacts, compared to the giant planets, whose atmospheres are primary, There are four terrestrial planets( planet that is composed primarily of  rocks or metals. ) Earth.: Mercury, Venus, Earth and Mars. They are made mostly of silicate rocks and metals, have solid surfaces, with atmospheres that range from very thick like on Venus to very thin like on Mercury.
      Of the four terrestrial planets, Earth and Mars are considered the most hospitable to life. Earth, of course, has life because it is known to have an active hydrosphere. Mars may have had life in the past, and it may exist there.


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