What is the main contribution of Canada's Lithoprobe Project?
A) discovering Canada's richest mineral deposits at the base of the crust
B) drilling deep holes to probe the Canadian lithosphere and explore for hydrocarbons along the way
C) multichannel reflection seismic profiling of the entire crustal architecture, to the base of the lithosphere
D) radiometric dating of the oldest rocks laid down at the base of the lithosphere
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