Coral spawning events, triggered by moon phase and water temperature, release billions of eggs in a single night.
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The ocean contains dissolved gold — approximately 20 million tons — but in concentrations too low to extract profitably.
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The siphonophore can grow to extraordinary lengths in the ocean depths.
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The geoduck clam can live over 150 years and is the largest burrowing clam in the world.
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The ocean contains structures larger than mountain ranges.
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Phytoplankton populations have declined by about 40% since 1950, threatening the marine food chain.
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The Great Barrier Reef supports thousands of marine species.
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Hydrothermal vents support unique ecosystems without sunlight.
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The world's deepest postbox is in Susami Bay, Japan — it sits 10 meters underwater and receives waterproofed mail.
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