Given the following context:  Since his death, Thomson's work has grown in value and popularity. Group of Seven member Arthur Lismer wrote that he "is the manifestation of the Canadian character". Another contemporaneous Canadian painter, David Milne, wrote to National Gallery of Canada Director H. O. McCurry in 1930, "Your Canadian art apparently, for now at least, went down in Canoe Lake. Tom Thomson still stands as the Canadian painter, harsh, brilliant, brittle, uncouth, not only most Canadian but most creative. How the few things of his stick in one's mind." For Canadian artists Roy Kiyooka and Dennis Lee, he is a "haunting presence" and "embodies the Canadian artistic identity".As of 2015, the highest price achieved by a Thomson sketch was Early Spring, Canoe Lake, which sold in 2009 for CAD$2,749,500. Few major canvases remain in private collections, making the record unlikely to be broken. One example of the demand his work has achieved is the previously lost Sketch for Lake in Algonquin Park. Discovered in an Edmonton basement in 2018, it sold for nearly half a million dollars at a Toronto auction. The increased value of his work has led to the discovery of numerous forgeries on the market.In 1967, the Tom Thomson Art Gallery opened in Owen Sound. In 1968, Thomson's shack from behind the Studio Building was moved to the McMichael Canadian Art Collection in Kleinburg. Many of his works are also on display at the National Gallery of Canada in Ottawa, the Art Gallery of Ontario, and the McMichael Canadian Art Collection in Kleinburg, Ontario. His influence can be seen in the work of later Canadian artists, including Joyce Wieland. In 2004, another historical marker honouring Thomson was moved from its previous location near the centre of Leith to the graveyard in which he is now buried. The grave site has become popular spot for visitors to the area with many fans of his work leaving pennies or art supplies behind as tribute.  answer the following question:  What is the last name of the person whose influence can be seen in the work of later Canadian artists?
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Answer: Thomson

Q: Given the following context:  The year 1960 marked another turning point in Shostakovich's life: he joined the Communist Party. The government wanted to appoint him General Secretary of the Composers' Union, but in order to hold that position he was required to attain Party membership. It was understood that Nikita Khrushchev, the First Secretary of the Communist Party from 1953 to 1964, was looking for support from the leading ranks of the intelligentsia in an effort to create a better relationship with the Soviet Union's artists. This event has been interpreted variously as a show of commitment, a mark of cowardice, the result of political pressure, or his free decision. On the one hand, the apparat was undoubtedly less repressive than it had been before Stalin's death. On the other, his son recalled that the event reduced Shostakovich to tears, and he later told his wife Irina that he had been blackmailed. Lev Lebedinsky has said that the composer was suicidal. From 1962, he served as a delegate in the Supreme Soviet of the USSR. Once he joined the Party, several articles he did not write denouncing individualism in music were published in Pravda under his name. In joining the party, Shostakovich was also committing himself to finally writing the homage to Lenin that he had promised before. His Twelfth Symphony, which portrays the Bolshevik Revolution and was completed in 1961, was dedicated to Vladimir Lenin and called "The Year 1917." Around this time, his health began to deteriorate. Shostakovich's musical response to these personal crises was the Eighth String Quartet, composed in only three days. He subtitled the piece "To the victims of fascism and war", ostensibly in memory of the Dresden fire bombing that took place in 1945. Yet, like the Tenth Symphony, this quartet incorporates quotations from several of his past works and his musical monogram. Shostakovich confessed to his friend Isaak Glikman, "I started thinking that if some day I die, nobody is likely to write a work in memory of me, so I had better write one myself."...  answer the following question:  What is the last name of the composer who was suicidal?
A: Shostakovich

Given the following context:  The seabed contains enormous reserves of minerals which can be exploited by dredging. This has advantages over land-based mining in that equipment can be built at specialised shipyards and infrastructure costs are lower. Disadvantages include problems caused by waves and tides, the tendency for excavations to silt up and the washing away of spoil heaps. There is a risk of coastal erosion and environmental damage. Seafloor massive sulphide deposits are potential sources of silver, gold, copper, lead and zinc and trace metals since their discovery in the 1960s. They form when geothermally heated water is emitted from deep sea hydrothermal vents known as "black smokers". The ores are of high quality but prohibitively costly to extract. Small scale mining of the deep sea floor is being developed off the coast of Papua New Guinea using robotic techniques, but the obstacles are formidable.There are large deposits of petroleum, as oil and natural gas, in rocks beneath the seabed. Offshore platforms and drilling rigs extract the oil or gas and store it for transport to land. Offshore oil and gas production can be difficult due to the remote, harsh environment. Drilling for oil in the sea has environmental impacts. Animals may be disorientated by seismic waves used to locate deposits, probably causing the beaching of whales. Toxic substances such as mercury, lead and arsenic may be released. The infrastructure may cause damage, and oil may be spilt.Large quantities of methane clathrate exist on the seabed and in ocean sediment at a temperature of around 2 °C (36 °F) and these are of interest as a potential energy source. Some estimates put the amount available at between one and 5 million cubic kilometres (0.24 to 1.2 million cubic miles). Also on the seabed are manganese nodules formed of layers of iron, manganese and other hydroxides around a core. In the Pacific these may cover up to 30 percent of the deep ocean floor. The minerals precipitate from seawater and grow very slowly. Their commercial extraction for...  answer the following question:  Which ores are of high quality but prohibitively costly to extract?
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Answer:
gold