COMM 201 Lecture Notes - Lecture 5: Late Heavy Bombardment, Planetary Differentiation, Latent Heat
30 Mar 2018
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Document Summary
20. 000 borehole measurements that the earth continuously emits ~ 44tw. Leftover energy from the accretion of hot gases and dust contributes very little ~ 5-10 % (primordial heat) Gravitational heat - the density sorting that resulted in the formation of the earth"s core. Latent heat due to the crystallization of the earth"s core. The inner core grows by ~ 1 cm released some energy, which can be considered another source of primordial heat. every 1000 yr, but this is a relatively minor heat source. 1 radioactive elements measuring geoneutrinos that are formed during radioactive decay monitors atomic explosions measuring antineutrino fluxes. Geotherm change in temperature with depth in the earth is called the geotherm different in different places. If heat is produced by radioactive decay we need to know the distribution of radioactive elements in the earth. Quite a lot is in the crust but the mantle also contributes significantly. The geotherm can be mathematically described by a differential equation.
