astro 7 questions with complete solutions 2024

astro 7terrestrial planet - correct answer An Earth-like planet, made of rock and metal and having a solid surface. In our Solar System, the terrestrial planets are Mercury, Venus, Earth, and Mars. comparative planetology - correct answer The study of planets through comparison of their chemical and physical properties. hydrosphere - correct answer The portion of Earth that is largely liquid water. lithosphere - correct answer The solid, brittle part of Earth (or any planet or moon), including the crust and the upper part of the mantle. biosphere - correct answer The global sum of all living organisms on Earth (or any planet or moon). tectonism - correct answer Deformation of the lithosphere of a planet. volcanism - correct answer The occurrence of volcanic activity on a planet or moon. igneous activity - correct answer The formation and action of molten rock (magma). magma - correct answer Molten rock, often containing dissolved gases and solid minerals. impact crater - correct answer The scar of the impact left on a solid planetary or moon surface by collision with another object.