Word: moho
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Dates: during 1960-1969
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Target Mohole. This effort is part of Project Mohole, which will cost more than $20 million. It is backed by the National Science Foundation, and its goal is to drill clear through the earth's crust to the "Moho,"* the boundary between the comparatively light rocks of the crust and the much denser mantle, which extends downward for i ,800 miles and whose properties are largely unknown. Geophysicists are sure that even one hole drilled to the Moho will tell invaluable volumes about the history, structure, content and behavior of the earth...
Never had any drilling been done in such deep water. The new tests that will start soon off Guadalupe will show what modifications of ship and drilling apparatus will be needed to drill through miles of rock down to the Moho itself...