Interior of the Earth
Direct Sources: Mining and deep drilling projects have provided large volume of information through the analysis of materials collected at different depths. Also when the molten material (magma) is thrown onto the surface of the earth, during volcanic eruption it becomes available for laboratory analysis. •Indirect Sources Analysis of properties of matter indirectly provides information about the interior. Through the mining activity, it is known that temperature and pressure increase with the increasing distance from the surface towards the interior in deeper depths. •Also, the density of the material also increases with depth. Knowing the total thickness of the earth, scientists have estimated the values of temperature, pressure and the density of materials at different depths. Another source of information are the meteors that at times reach the earth. •The material and the structure observed in the meteors are similar to that of the earth. They are solid bodies dev