Answer the following questions in about 30 words.
iv) Briefly explain the indirect sources of information of the interior of the
earth other than those of seismic activity.
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The knowledge about interior of the earth is obtained through direct sources and indirect sources. Direct sources include rock materials from mining areas and molten magma from volcanic eruptions. ... Indirect sources include meteors that at times reach the earth, gravitation, magnetic field, and seismic activity.
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