migrated from stackoverflow.com Jun 20 '10 at 3:23. 1  Excel is a spreadsheet application that saves files into its own format while CSV is a standard of saving tabular information into a delimited text file. 2  CSV is a very old method of saving tables compared to Excel.
Authigenic sediment, deep-sea sediment that has been formed in place on the seafloor. The most significant authigenic sediments in modern ocean basins are metal-rich sediments and manganese nodules.
The periodic table had two vacant slots below manganese and finding these missing elements, technetium and rhenium, proved difficult. Rhenium was the lower one and indeed it was the last stable, non-radioactive, naturally-occurring element to be discovered. In 1905, Masataka Ogawa found it in the mineral thorianite from Sri Lanka.