GEOL 212 Study Guide - Quiz Guide: Orbital Period, Radiogenic Nuclide, Tidal Force
26 Dec 2017
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Where is radiogenic heat concentrated: most long-lived radioisotopes are lithophiles. As a result, radiogenic heat arises in the mantle and crust. In fact, heavy atoms like those of thorium or uranium are incompatible that is, their large size inhibits their ability to assume a close packing in high-pressure crystals. Tidal deformation of moon: one last ongoing source of planetary heat comes from tidal forces, we have discussed the nature of tides already, but not their effect on objects that experience them. Whenever a tidal bulge is raised, frictional heat is generated. If a large bulge is being raised in solid material, considerable frictional heating results. Io - the extreme example: the strength of jupiter"s gravitational pull is proportional to the inverse square of its distance. Because io orbits very close to jupiter, this means that its jupiter- facing side is pulled noticeably more strongly than the side facing away. Remember, io"s rotation is synchronous with its orbit.
