Earth, Seismology: wave-velocity and density distributions
The main difficulty with studying the Earth's interior is apparent from Figure 15 . Rock fragments (called xenoliths) are brought up volcanically from depth, thus providing samples of the upper mantle. These samples, however, seem to originate at depths no greater than 150 to 200 kilometres. Therefore, the material making up more than 90 percent of the interior is inaccessible
posted by OpenMap @ 11:48 AM
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