Earth Sciences 1086F/G Lecture Notes - Lecture 8: Inner Core, Photosynthesis, Paleozoic
19 Dec 2017
School
Department
Course
Professor
Document Summary
The earth grew by accretion (growth by accumulation of smaller bodies, dust and gas) Impact: then comes theia and completely changes the shape the earth and gave us our only satellite, the moon (more info in chapter 6) When earth was first formed, there was a zonation of heavy elements in the core and lightest at the top. Differentiation process of chemical zonation from core to surface. From surface to core, both pressure, temperature and density increase. Oder surface to core: atmosphere, hydrosphere, lithosphere. Mountain building, volcanism, earthquake activity and creation of ocean basins originate: mesosphere. Stuff like rock behave like very stiff plastic because it"s so hot, but not as hot as in the core: outer core, inner core. Somewhere between 5000 and 7000 c which makes it hotter than the sun"s surface, which is ~5500 c. Earth and the sun have internal generators" of electric current, which in turn produce a magnetic field.
