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surface

How was stonehenge built?

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STONEHENGE On a fine midsummer morning, dawn breaks slowly over Salisbury Plain. For a full hour before sunrise, Stonehenge, that prehistoric circle of standing...
How to breathe and stay underwater

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STAYING UNDERWATER Until man invented ways of staying underwater for more than a few minutes, the wonders of the world below the sea were...
Oil exploration

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EXPLORATION FOR OIL Petroleum, or oil, is the world's most important source of energy. It is produced in more than sixty countries throughout the world,...
The erthquake predicor - hetmap

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EARTHQUAKE PREDICTION Can earthquakes be predicted? Scientists are working on programs to predict where and when an earthquake will occur. They hope to develop...