Se han podido estudiar por métodos directos la transformación mineralógica que experimentan los materiales del manto a la profundidad de 670 km. Explica qué método se usa para esto.

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the glands which are associated with each description is given below:

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.