Children's Encyclopedia1976 |
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Pàgina 10
... feet . The fast - flying Concorde is flying at 56,000 feet . There is not enough air for people to breathe at the height these planes fly at . So the planes have to take their own air supply with them . The dark blue area below shows ...
... feet . The fast - flying Concorde is flying at 56,000 feet . There is not enough air for people to breathe at the height these planes fly at . So the planes have to take their own air supply with them . The dark blue area below shows ...
Pàgina 11
... feet . The highest a man has flown is about 22 miles . Helicopters can fly as high as 32,000 feet ( right ) . Man first rose off the ground because hot air rises . In 1783 the Montgolfier brothers in France filled a cloth bag with hot ...
... feet . The highest a man has flown is about 22 miles . Helicopters can fly as high as 32,000 feet ( right ) . Man first rose off the ground because hot air rises . In 1783 the Montgolfier brothers in France filled a cloth bag with hot ...
Pàgina 18
... feet . Divers wearing helmets and with air pipes to the surface ( 2 ) can can reach below 500 feet . Ordinary submarines can cruise at 2,000 feet . A very special submarine called a bathyscaphe ( 3 ) has been down about 36,000 feet ...
... feet . Divers wearing helmets and with air pipes to the surface ( 2 ) can can reach below 500 feet . Ordinary submarines can cruise at 2,000 feet . A very special submarine called a bathyscaphe ( 3 ) has been down about 36,000 feet ...
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