Oceanic crust Oceanic crust Oceanic crust is the uppermost layer of the oceanic portion of a tectonic plate. It is composed of the upper oceanic crust, with pillow lavas and a dike complex, and the lower oceanic crust, composed of troctolite, gabbro and ultramafic cumulates. The crust overlies the solidified and uppermost layer of the mantle. The crust and the solid mantle layer together constitute oceanic lithosphere. Oceanic crust is primarily composed of mafic rocks, or sima, which is rich in iron and magnesium. It is thinner than continental crust, or sial, generally less than 10 kilometers thick; however it is denser,
Do Not Ask What Good We Do the 2010 election. A majority of those he spoke with and listened to were Republicans, especially among the 87 new legislators. The title of the book, "Do Not Ask What Good We Do", is taken from a sentence in a letter from Fisher Ames to Thomas Dwight, dated May 30, 1796: "Do not ask what good we do : that is not a fair question, in these days of faction." The prologue to the book details how, on the night of Obama's inauguration, a group of around 15 Republican Representatives and Senators met in the Caucus Room, a "high-end D.C.