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The deuterium to hydrogen ratio for ocean water on Earth is known very precisely to be (1.5576 ± 0.0005) × 10 −4. [35] This value represents a mixture of all of the sources that contributed to Earth's reservoirs, and is used to identify the source or sources of Earth's water.
The first true ocean-going boats were invented by the Austronesian peoples, using technologies like multihulls, outriggers, crab claw sails, and tanja sails. This enabled the rapid spread of Austronesians into the islands of both the Indian and the Pacific Oceans , known as the Austronesian expansion .
The first long-distance ocean crossing in human history and the first humans to reach Remote Oceania. [ 5 ] [ 9 ] Austronesians in Island Southeast Asia establish the Austronesian maritime trade network with Southern India and Sri Lanka , resulting in an exchange of material culture , including boat and sailing technologies and crops like ...
The first models could hold several individuals and allowed limited visibility but enabled marine biologists to see and photograph the deeper portions of the oceans. [29] Remotely operated underwater vehicles are now used with and without submersibles to see the deepest areas of the ocean that would be too dangerous for humans. ROVs are fully ...
Magic and Gracie off Castle Garden, painted by James E. Buttersworth, c. 1871. Maritime history is the study of human interaction with and activity at sea. It covers a broad thematic element of history that often uses a global approach, although national and regional histories remain predominant.
The first eon in Earth's history, the Hadean, begins with the Earth's formation and is followed by the Archean eon at 3.8 Ga. [2]: 145 The oldest rocks found on Earth date to about 4.0 Ga, and the oldest detrital zircon crystals in rocks to about 4.4 Ga, [34] [35] [36] soon after the formation of the Earth's crust and the Earth itself.
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According to Poseidonius, later reported in Strabo's Geography, the monsoon wind system of the Indian Ocean was first sailed by Eudoxus of Cyzicus in 118 or 116 BC. [13] Nautical charts and textual descriptions known as sailing directions have been in use in one form or another since the sixth century BC. [14]