penetrability of rock

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Alfred Lawson — Alfred W. Lawson Alfred William Lawson (* 24. März 1869 in London; † 29. November 1954 in San Antonio) war ein US amerikanischer Baseballspieler und manager, Luftfahrtpionier, Autor, Erfinder einer allumfassenden … Deutsch Wikipedia
undersea exploration — Introduction the investigation and description of the ocean waters and the seafloor and of the Earth beneath. Primary objectives and accomplishments Included in the scope of undersea exploration are the physical and chemical… … Universalium
naval warfare — Military operations conducted on, under, or over the sea and waged against other seagoing vessels or targets on land or in the air. The earliest naval attacks were raids by the armed men of a tribe or town using fishing boats or merchant ships.… … Universalium

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