Answer the question from the given passage. Your answer should be directly extracted from the passage, and it should be a single entity, name, or number, not a sentence.
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Question: Passage: As northwest Europe slowly began to warm up from 22,000 years ago onward, frozen subsoil and expanded alpine glaciers began to thaw and fall-winter snow covers melted in spring. Much of the discharge was routed to the Rhine and its downstream extension. Rapid warming and changes of vegetation, to open forest, began about 13,000 BP. By 9000 BP, Europe was fully forested. With globally shrinking ice-cover, ocean water levels rose and the English Channel and North Sea re-inundated. Meltwater, adding to the ocean and land subsidence, drowned the former coasts of Europe transgressionally. Question: What did frozen subsoil and expanded alpine glaciers begin to do?

Answer: thaw


Question: Passage: In 1939 Chinese Nationalist soldiers took the mausoleum from its position at the 'Lord's Enclosure' (Mongolian: Edsen Khoroo) in Mongolia to protect it from Japanese troops. It was taken through Communist-held territory in Yan'an some 900 km on carts to safety at a Buddhist monastery, the Dongshan Dafo Dian, where it remained for ten years. In 1949, as Communist troops advanced, the Nationalist soldiers moved it another 200 km farther west to the famous Tibetan monastery of Kumbum Monastery or Ta'er Shi near Xining, which soon fell under Communist control. In early 1954, Genghis Khan's bier and relics were returned to the Lord's Enclosure in Mongolia. By 1956 a new temple was erected there to house them. In 1968 during the Cultural Revolution, Red Guards destroyed almost everything of value. The 'relics' were remade in the 1970s and a great marble statue of Genghis was completed in 1989. Question: What is the Mongolian name for the original place of the Genghis Khan mausoleum?

Answer: Edsen Khoroo


Question: Passage: The principle of faunal succession is based on the appearance of fossils in sedimentary rocks. As organisms exist at the same time period throughout the world, their presence or (sometimes) absence may be used to provide a relative age of the formations in which they are found. Based on principles laid out by William Smith almost a hundred years before the publication of Charles Darwin's theory of evolution, the principles of succession were developed independently of evolutionary thought. The principle becomes quite complex, however, given the uncertainties of fossilization, the localization of fossil types due to lateral changes in habitat (facies change in sedimentary strata), and that not all fossils may be found globally at the same time. Question: Whose principles were the principle of faunal succession built upon?

Answer:
William Smith


