On top of the world
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Tenzing Norgay, and a New Zealander, Edmund Hillary, reached the highest point on the Earth's surface. Since then, many people have climbed Everest, and all the world's major peaks have been conquered.
It is now possible to map mountains from the air so that mountaineering routes can be carefully worked out in advance. Also, equipment has improved so that sheer rock faces can be readily climbed. Altitude sickness and avalanches of ice and snow are now the main hazards faced by climbers.
Sediments are deposited in the seas and form layers which eventually turn into rock. Movement of the Earth's crust can force these layers up into folds, and stresses in the crust lead to cracks. This may cause whole areas of crust to subside or be forced up into mountain chains.
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Date Added: 09 December '11
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