when was the structure of the earth discovered
Structure of the Earth The inner core was discovered in 1936 by Inge Lehmann and is generally believed to be composed primarily of iron and some nickel. Since this layer is able to transmit shear waves (transverse seismic waves), it must be solid. Experimental evidence has at times been critical of crystal models of the core.[13] Other experimental studies show a discrepancy under high pressure: diamond anvil (static) studies at core pressures yield melting temperatures that are approximately 2000Â K below those from shock laser (dynamic) studies.[14][15] The laser studies create plasma,[16] and the results are suggestive that constraining inner core conditions will depend on whether the inner core is a solid or is a plasma with the density of a solid. This is an area of active research.
Limit of a function (the Dirichlet function) has no limit at any x-coordinate.
Red Fort It was designated a UNESCO World Heritage Site in 2007 as part of the Red Fort Complex.[2][6]
Backshore Sediments in this area are well-sorted and well-rounded. Its grain sizes are mainly coarse sand and medium sand, which are larger than that in littoral barrier dune.The sedimentary structures include parallel bedding and low-angle cross-bedding.