Crust (geology) the crust. The boundary between the crust and mantle is conventionally placed at the Mohorovičić discontinuity, a boundary defined by a contrast in seismic velocity. The crust of the Earth is of two distinctive types: Because both continental and oceanic crust are less dense than the mantle below, both types of crust "float" on the mantle. This is isostasy, and it's also one of the reasons continental crust is higher than oceanic: continental is less dense and so "floats" higher. As a result, water pools in above the oceanic crust, forming the oceans. The temperature of the crust increases with
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