which sources are called direct sources? why?
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Direct sources include rock materials from mining areas and molten magma from volcanic eruptions. Besides, scientists are working on “Deep Ocean drilling Project” and “Integrated Ocean Drilling Project”.
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Interior of the Earth. The direct sources of information about the interior of the earth are : (i) Earth material or rock availed from mining areas and deep drilling projects. (ii)Materials availed from the volcanic eruptions.
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