By John Woodward

DK, the simplest reference writer, meets Google(tm), the world's top seek engine in a complete and authoritative sequence that is on-line, and units the benchmark for reference. offering whole and visually arresting reference at a completely new point, e-links lead you to on-line info you cannot get in a e-book: stay and archival pictures; sound buttons; interactive polls, quizzes, and video games; hyperlinks to organisations and the newest study. each one e-link tells you which of them key-phrase to use-then Google(tm) / DK take you immediately to the secure, applicable, and actual on-line details. realize the wonderful abundance and diversity of vegetation and animals that make the sea their home-from deep, darkish trenches, to lush, tropical atolls. additionally know about the currents, cycles, and lifetime of the sea itself, and the way the future health of the sea impacts existence far and wide in the world

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In the Southern Ocean, the eastward flow continues around Antarctica, but elsewhere the continents force the currents to form ocean-scale circulations called gyres. These flow in opposite directions north and south of the equator, while offshoots of the main gyres flow into the Arctic Ocean and around southern Africa. 49 Narrow, fast, warm western boundary current Broad, slow, cool eastern boundary current < boundary currents Equatorial currents flow westward in the Atlantic and Pacific, so ocean water tends to pile up against the continents.

Direction of wave motion wave development Trough Chop Ripples grow bigger and develop into a confused choppy sea, with waves up to 20 in (50 cm) high. The distance between the crests can vary from 10 ft (3 m) to 40 ft (12 m). They interact with each other to create a chaotic effect. These disordered waves are typical of areas where the waves are being whipped up by strong winds. Swell The disordered chop of the sea becomes a regular series of waves called a swell. Though the distance between crests is much more predictable, the waves can grow higher if the wind is still blowing and the waves are able to travel over a big ocean.

31 < Airborne dust Huge quantities of airborne dust end up in the oceans and slowly settle through the water to add to the deep sediments forming the abyssal plains. A lot of dust is erupted from volcanoes, especially during catastrophic events like the 1991 eruption of Mount Pinatubo in the Philippines. The 1815 explosion of the Tambora volcano in Indonesia ejected so much dust that the sun was obscured for several months, causing the "year without a summer" in 1816. Much of this volcanic dust ended up in the oceans.

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