Caves and mines are only go up to 1-2 km inside the Earth.The World's most deepest wells ,such as the one 12 km deep in the Russian Kola Peninsula or the 9 km deep one in the upper palatinate, scarcely scartch the Earth's curst .One can look deep inside the Earth in the after effects of earthquakes or by launch nuclear explosions. After some times sounds and seismic waves are generated by this explosions. They also throw off rock particles. By calculate their intensity and timings,scientists discover the composition of the Earth's interiors.
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1 comment:
Superb!
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