- Bill Clinton (Wikipedia)
William Jefferson Clinton (né Blythe III; born August 19, 1946) is an American politician who served as the 42nd president of the United States from 1993 to 2001. A member of the Democratic Party, he previously served as governor of Arkansas from 1979 to 1981 and again from 1983 to 1992. Clinton, whose policies reflected a centrist “Third Way” political philosophy, became known as a New Democrat.
- https://en.wikipedia.org/wiki/Continental_crust
- Continental crust (Wikipedia)
Continental crust is the layer of igneous, metamorphic, and sedimentary rocks that forms the geological continents and the areas of shallow seabed close to their shores, known as continental shelves. This layer is sometimes called sial because its bulk composition is richer in aluminium silicates (Al-Si) and has a lower density compared to the oceanic crust, called sima which is richer in magnesium silicate (Mg-Si) minerals. Changes in seismic wave velocities have shown that at a certain depth (the Conrad discontinuity), there is a reasonably sharp contrast between the more felsic upper continental crust and the lower continental crust, which is more mafic in character.