AST-1001 Lecture Notes - Lecture 7: Subduction, Apidae, Solar Wind
Document Summary
Earth is the only planet in our solar system with a hydrosphere, or surface water. We also have an atmosphere and a diverse landscape. Terrestrial planets are differentiated into separate layers: Dense metallic cores, less dense rocky mantles, and low density crusts. Cratered surfaces are old; smooth surfaces (plains) are young. Heat flowing outward from a planet can make it geologically active heat escaping, expansion. Mercury and the moon have negligible atmospheres. Venus has a thick atmosphere (90x that of earth) Mars and earth have relatively thin atmospheres. Earth has a solid inner core and a liquid outer core, a mantle, and crust. 75% of ea(cid:396)th"s su(cid:396)fa(cid:272)e is (cid:272)o(cid:448)e(cid:396)ed (cid:271)(cid:455) li(cid:395)uid (cid:449)ate(cid:396) Earth is neither entirely solid nor entirely rock. Crust floats and shifts on a layer of molten rock (a plastic-like material) We a(cid:396)e a(cid:271)le to e(cid:454)plo(cid:396)e ea(cid:396)th"s i(cid:374)te(cid:396)io(cid:396) (cid:271)e(cid:272)ause of ea(cid:396)th(cid:395)uakes. P stands for pressure, or primary waves; these come first; can travel through liquids.
