How is that knowledge about interior of the earth is based on indirect

1.	How is that knowledge about interior of the earth is based on indirect observation
Answer» Knowledge of the earth\'s interior is based on indirect observation as it is impossible to collect data regarding the earth\'s interior, we can\'t dig on such a great extent ,as their is intolerable heat deep inside the earth and it is impossible for any organism to survive their.. Therefore the the observation including the earth\'s interior is based on indirect observations like soil exposed on the surface after earthquake or rocks formed after cooling of magma.

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