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,
1066 The Battle for Middle Earth and Hastings, the little village was, according to the book, "laid to waste" in 1066. In the series, it serves as the hometown for the fictional peasant soldiers Tofi, Leofric, and Ordgar, whose names are actual Anglo-Saxon names from the period. Viewers may assume that the programme's title refers to "The Lord of the Rings" books, but Hardy chose "Middle Earth" because Anglo-Saxons frequently used the term to describe their world. He notes that J. R. R. Tolkien, an Oxford professor of Anglo-Saxon, used it, along with other Anglo-Saxon words, for the same reasons. 1066 The Battle for Middle Earth