| | TIME.com: Down to Moho -- Apr. 6, 1959 -- Page 1 (Site not responding. Last check: 2007-11-06) |
 | | The Moho was discovered in 1909 by Seismologist A. Mohorovicic of Yugoslavia, when he noticed that the speed of earthquake waves increases suddenly at a certain level under the earth's surface (the depth varies from place to place). |
 | | Geologists believe that the Moho is the bottom edge of the granite and basalt that forms the lower layer of the earth's crust; under it is the earth's mantle consisting of a mixture of silicates and nickel-iron, which in turn encloses the nickel-iron core. |
 | | The floor may be three miles beneath the ocean's surface, but the Moho lies only three or four miles deeper, under a thin skin of sedimentary deposits and a layer of basalt. |
| www.time.com /time/magazine/article/0,9171,810904,00.html (765 words) |