Geology of solar terrestrial planets Geology of solar terrestrial planets The geology of solar terrestrial planets mainly deals with the geological aspects of the four terrestrial planets of the Solar System – Mercury, Venus, Earth, and Mars – and one terrestrial dwarf planet: Ceres. Earth is the only terrestrial planet known to have an active hydrosphere. Terrestrial planets are substantially different from the giant planets, which might not have solid surfaces and are composed mostly of some combination of hydrogen, helium, and water existing in various physical states. Terrestrial planets have a compact, rocky surfaces, and Venus, Earth, and Mars each also have an atmosphere.
Gustav Holst he and other younger English composers had adopted Holst's economy of style: "With what enthusiasm did we pare down our music to the very bone". Short cites other English composers who are in debt to Holst, in particular William Walton and Benjamin Britten, and suggests that Holst's influence may have been felt further afield. Above all, Short recognises Holst as a composer for the people, who believed it was a composer's duty to provide music for practical purposes—festivals, celebrations, ceremonies, Christmas carols or simple hymn tunes. Thus, says Short, "many people who may never have heard any of [Holst's] major