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Correct Option is 1 and 2 only

Most of our knowledge about the interior of the earth is largely based on estimates and inferences. Yet, a part of the information is obtained through direct observations and analysis of materials. Direct Sources include mining and drilling inside the earth, Volcanic eruption forms another source of obtaining direct information. Analysis of properties of matter (Temperature, Pressure and Density) indirectly provides information about the interior. The other indirect sources include gravitation, magnetic field, and seismic activity.

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