Heavy metal meets hard rock: Battling through the ocean crust's hardest rocks

Integrated Ocean Drilling Program (IODP) Expedition 335 Superfast Spreading Rate Crust 4 recently completed operations in Ocean Drilling Program (ODP) Hole 1256D, a deep scientific borehole that extends more than 1500 meters below the seafloor into the Pacific Ocean's igneous crust – rocks that formed through the cooling and crystallization of magma, and form the basement of the ocean floor.

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