Chapter 1 The composition of the earth

摘要: This chapter describes the composition of earth. The geophysical, geochemical, and geological characteristics Earth reveal much about planet's overall system. However, when describing whole body, such information requires considerable integration interpretation to see through last 4.6 Ga history. Therefore, improving understanding Earth's yields insights into how planet formed evolved, as well providing planetary neighbors. Estimating derivation core silicate (crust plus mantle) composition. Meteorites observable extrasolar processes provide knowledge nature, composition, evolution solar is made up three major distinctly different units—namely, core, mantle-crust system, atmosphere-hydrosphere These units are products differentiation distinctive in Combined studies meteorities mantle samples place important constraints on compositional models for Earth. fraction has a that similar some stony meteorites, or achondrites. meteorites come from shells differentiated planets have also had metallic extracted.