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Pearl diving methods, diving endurance, and pressure training are discussed alongside the regions where pearls are 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does the book say about exploring the sea compared with exploring land?","Question",{"text":63,"@type":64},"Land has been explored and mapped, but the vast world beneath the sea is only just beginning to be explored.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"How were ancient dives described in the text?",{"text":68,"@type":64},"The text notes that men dived for thousands of years, with historical examples such as divers used by Xerxes in 460 B.C. and divers at the siege of Tyre in 333 B.C.",{"name":70,"@type":61,"acceptedAnswer":71},"How does the book explain how pearls form?",{"text":72,"@type":64},"A pearl forms inside the shell of a pearl-oyster when the oyster coats an interior intrusion, such as a grain of sand, with layers of mother-of-pearl until it becomes smooth and perfectly 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book tells of man's achievements inunderwater exploration and travel.With cleartext and superb colour illustrations it describesthe world under the sea,the early divers andgradual development of diving helmets,suitsand other equipment,the invention of thesubmarine and the latest devices for exploringat great depths.  \nA LADYBIRDACHIEVEMENTSBOOK216  \nNET  \nSeries 601  \nUNDERWATEREXPLORATION  \nbyRICHARD BOWOOD  \nwith illustrations by  \nB.KNIGHT  \nPublishers:Wills &Hepworth Ltd.,Loughborough  \nPrinted in England  \n⑤  \nFirst published 1967  \n# The World beneath the Sea\n\nMan has explored and mapped the dry land;he hasclimbed the highest mountains,penetrated the densestjungles and crossed the most desolate deserts.All theseare measured and known,but the exploration of thevast world beneath the sea has only just begun.  \nNearly three-quarters of the earth's surface is waterto an average depth of two and three-quarter miles.Theimmense area of the ocean bed with its great level plains,its sunken mountain ranges and its deep canyons stillawaits the explorers.  \nThe seas teem with animal and plant life.There aremore than twenty thousand species of fish of everyshape,size and colour.The largest sea creature is thewhale,and a blue whale can weigh a hundred tons.Thesmallest are so tiny that they can only be seen through amicroscope,yet they are of dreamlike beauty.Betweenthese two extremes is a great range of creatures;fish,crustaceans such as lobsters and crabs,and suchmolluscs as the giant squid and the oyster and cockle.  \nUnderwater plants have an infinite variety,too;thereare many kinds of seaweed,and countless strange plants.There are even some sea creatures which look likeplants.  \nIn the eternal darkness of the deep,live animals andplants which man has not yet seen.This book describesman's exploration and achievements in this strangeworld of the sea.  \nThe strange world of the sea  \n4  \n# Divers of Ancient Days\n\nModern science has made it possible for man to de-scend safely to considerable depths,and to stay under-water for a long time.He can wear a diving suit with anair-tube to the surface,or he can carry his air supplystrapped to his back with a tube to his mouth.He cango down in a submarine or in a specially constructedobservation chamber.  \nBut when a man dives without any equipment he canonly stay under as long as he can hold his breath,andthe depth to which he can go with safety is limited by theweight of the water above him,which exerts a consider-able pressure on the body.At thirty feet this pressure isthirteen pounds per square inch,at one hundred feet itis forty-five pounds per square inch,and at one hundredand fifty feet it becomes sixty-six pounds  \nMen have dived for thousands of years,but stayedunder only for short periods.Xerxes,King of Persiaemployed a famous Greek diver in 460 B.C.to dive tosalvage treasure from sunken ships.Alexander theGreat used divers at the siege of Tyre in 333 B.C.todestroy the booms put up by the enemy to defend thecity from his ships.  \nDivers were used in ancient days to collect coral,mother-of-pearl and sponges from the bed of the Medi-terranean.Sponges are still obtained by divers whoplunge from boats,holding a heavy stone fastened to arope.The weight takes them quickly to the bottom,where they cut the sponges with a knife,put them in abag,tug the rope as a signal and are hauled to thesurface.  \nXerxes,King of Persia,sees a gold breastplatebrought up by Scyllis—a famous diver—in 460 B.C.  \n# Pearl Diving\n\nOne of the most beautiful and precious gems isthe pearl,which is found at the bottom of the sea.Apearl is a growth inside the shell of a pearl-oyster.Oysters line their shells with a very smooth substancecalled mother-of-pearl,and if anything gets inside ashell the oyster makes that smooth too.If,for example,a grain of sand gets in the shell,the oyster covers it withlayers of mother-of-pearl,until it becomes perfectlysmooth","cbCaioGLmIiO38iQ","https://ap.wps.com/l/cbCaioGLmIiO38iQ","pdf",1862421,56,"English","# The World beneath the Sea\n## Divers of Ancient Days\n## Pearl Diving","[{\"question\":\"What does the book say about exploring the sea compared with exploring land?\",\"answer\":\"Land has been explored and mapped, but the vast world beneath the sea is only just beginning to be explored.\"},{\"question\":\"How were ancient dives described in the text?\",\"answer\":\"The text notes that men dived for thousands of years, with historical examples such as divers used by Xerxes in 460 B.C. and divers at the siege of Tyre in 333 B.C.\"},{\"question\":\"How does the book explain how pearls form?\",\"answer\":\"A pearl forms inside the shell of a pearl-oyster when the oyster coats an interior intrusion, such as a grain of sand, with layers of mother-of-pearl until it becomes smooth and perfectly formed.\"}]","The World beneath the Sea - Divers of Ancient Days - Pearl Diving | 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