Introductory Astronomy. Earth is a Planet. Inside Earth. In molten Earth chemical differentiation . Fe , Ni rich core, Si crust and mantle Density 5500 kg/m 3 Pressure, density, temperature increase with depth Internal structure studied via seismology. Internal Heat.
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Earth is a Planet
V and absorbs a fraction of IR
Nearside: Maria, Craters
Farside: Craters, no Maria