'Lying just below the crust, this largest of the earth's layers is about 1,800 miles thick'
the mantle
GEOLOGY: Lying just below the crust, this largest of the earths layers is about 1,800 miles thick
Lying just below the crust, this largest of the earth's layers is about 1,800 miles thick
Lying just below the crust, this largest of the earth's layers is about 1,800 miles thick
GEOLOGY
the mantle
GEOLOGY