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Comment: 18:42 - 19:32 (00:50)
Source: Annenberg/CPB Resources - Earth Revealed - 4. The Sea Floor
Keywords: resource, oil, gas, "mid-oceanic ridge", metal, manganese, copper, zinc, iron, gold, "hydrothermal vent", nodule

Our transcription: Some researchers are trying to understand where valuable geological resources are located on the sea floor.
In a world of diminishing raw materials, the hope of exploiting the oceans for their resources has persisted for decades.
At present, the only geologic resources being tapped from the sea floor are oil and gas, which occur within the shallow continental shelves.
But in recent years, exploration has revealed many other resources.
At the mid-ocean ridges, for example, copper, zinc, iron, gold, and other metals are being actively deposited from hydrothermal vents.
On the deep sea floor, nodules of valuable manganese ore are scattered by the millions.

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