ESS205H1 Study Guide - Midterm Guide: Continental Crust, Water Cycle, Hydrosphere
Document Summary
Lecture 1: why study the history of the earth? geology the science that studies the history of earth and its life. Understanding changes by analysing the system and access those changes tells us how natural processes affect humans how humans affect natural processes: earth system spheres. Hydrosphere earth"s water (liquid, water, ice, glaciers). Main portion of the hydrosphere lies in the oceans (97%) 75% of water that covers the. Atmosphere a gaseous layer surrounding the planet, receives heat from the sun, protect earth from sun"s rays. Biosphere - all organisms living in the earth how they interact: (example) There was no continental crust; there was a big magma ocean (earth was completely molten); there were asteroid impacts; atmosphere was dense and toxic. How did the earth"s core form? a planetary fragment or meteorite hit the earth kinetic energy transformed to heat energy earth was molten metal droplets separate and sink. Heavier elements started sinking like iron and nickel.
