Structure of the Earth discontinuity (a second order discontinuity). The uppermost mantle together with the crust constitutes the lithosphere. The crust-mantle boundary occurs as two physically different events. First, there is a discontinuity in the seismic velocity, which is most commonly known as the Mohorovičić discontinuity or Moho. The cause of the Moho is thought to be a change in rock composition from rocks containing plagioclase feldspar (above) to rocks that contain no feldspars (below). Second, in oceanic crust, there is a chemical discontinuity between ultramafic cumulates and tectonized harzburgites, which has been observed from deep parts of the oceanic crust that have been
The Lord of the Rings: The Battle for Middle-earth of "The Battle for Middle-earth" sold 230,000 copies and earned $9.4 million by August 2006, after its release in December 2004. It was the country's 89th best-selling computer game during this period. It received a "Gold" sales award from the Entertainment and Leisure Software Publishers Association (ELSPA), indicating sales of at least 200,000 copies in the United Kingdom. The critical response to "The Battle for Middle-earth" was fairly positive. The video game review aggregator GameRankings displays an average critic score of 82.5%, with about two-thirds of the reviews in the 80%s. IGN praised the game for its visual flair and