'The Gutenberg Discontinuity is the boundary that separates the core from this part of the earth'
the mantle
SCIENCE: The Gutenberg Discontinuity is the boundary that separates the core from this part of the earth
The Gutenberg Discontinuity is the boundary that separates the core from this part of the earth
The Gutenberg Discontinuity is the boundary that separates the core from this part of the earth
SCIENCE
the mantle
SCIENCE