we cannot hope to travel to the metal to the study it but we can study substance from the metal can you tell what this substance would be and how can we get

Dear Student, 
The Earth is divided into many layers. Mantle is one of these layers. It is located between the core and the crust. We cannot hope to travel to the mantle but we can study about the objects from the mantle. These substances are the rocks. These rocks can be obtained by digging in the earth's surface. These rocks can also be obtained from the volcanic eruptions as the rocks come out of the mantle in the form of lava during volcanic eruptions. When the lava cools down it becomes rock. 
Regards. 

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