The Earth's upper mantle is composed predominantly of peridotite, an ultramafic rock rich in olivine and pyroxene, as inferred from mantle xenoliths, ophiolite sequences, and geophysical/seismic evidence.
Peridotite, an ultramafic rock dominated by olivine with subordinate pyroxene, is the principal constituent of the Earth's upper mantle, as confirmed by mantle xenolith samples,...
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