Answers

2014-10-16T17:20:51+08:00
In geology, the crust is the outermost solid shell of a rocky planet or natural satellite, which is chemically distinct from the underlying mantle. The crusts of Earth, the MoonMercuryVenus,MarsIo, and other planetary bodies have been generated largely by igneous processes, and these crusts are richer in incompatible elements than their respective mantle
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