Our Earth is full of countless mysteries. Everyday some new information about the earth comes out. Sometimes an animal is found, which can live without oxygen, sometimes the secret of human beings comes out. Scientists have the deepest hole ever in the sea. It is believed that this is the deepest place in the Earth and scientists have not been able to go to its full depth even. & Nbsp; Scientists have named it Challenger Deep. Scientists say that it may take a long time to find out its fullโฆ
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