In this task, you're expected to write answers to questions involving multiple references to the same entity. The answer to the question should be unambiguous and a phrase in the paragraph. Most questions can have only one correct answer.
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Question: Passage: The attribution of the panel reflects the progression and trends of 19th and 20th-century scholarship on Early Netherlandish art. It is now thought to have been completed c. 1438–40, but there are still arguments for dates as early as 1424–29. As with the pages ascribed to Hand G in the Turin-Milan Hours manuscript, the panel was attributed to Jan's brother Hubert van Eyck in the 1875 Gemäldegalerie catalogue, and by a 1911 claim by art historian Georges Hulin de Loo. This is no longer considered credible and Hubert, today, is credited with very few works. By 1912 the painting had been definitively attributed to Jan in the museum catalogue.Attempts to date it have undergone similar shifts of opinion. In the 19th century the panel was believed to be an early work by Jan completed as early as c. 1410, although this view changed as scholarship progressed. In the early 20th century, Ludwig von Baldass placed it around 1424–29, then for a long period it was seen as originating from the early 1430s. Erwin Panofsky provided the first detailed treatise on the work and placed it around 1432–34. However, following research from Meyer Schapiro, he revised his opinion to the late 1430s in the 1953 edition of his Early Netherlandish Painting. A 1970s comparative study of van Eyck's 1437 Saint Barbara concluded that Madonna in the Church was completed after c. 1437. In the 1990s, Otto Pächt judged the work as probably a late van Eyck, given the similar treatment of an interior in the 1434 Arnolfini Portrait. In the early 21st century, Jeffrey Chipps Smith and John Oliver Hand placed it between 1426 and 1428, claiming it as perhaps the earliest extant signed work confirmed as by Jan. 
Question: What is the full name of the person who is credited with very few works?

Answer: Hubert van Eyck.


Question: Passage: On Sunday 1 November the marchers proceeded to Hyde Park for a hastily organised public meeting. The Communist Party was holding a general rally in the park against unemployment; Wilkinson records that they "generously gave way for an hour and asked their great audience to swell our Crusade meeting". The police made a low estimate of 3,000 for the crowd, but the journalist Ritchie Calder, who was present, put the figure at 50,000.After a day's rest, the marchers' main event on Tuesday was a public meeting in the Memorial Hall, Farringdon Street. Among the guest speakers was the Rev. Canon Dick Sheppard,  founder of the Peace Pledge Union. He told the marchers: "You have so aroused the conscience of the country that things are bound to happen". Sir John Jarvis, without prior warning, then revealed plans for a steel tubes mill on the Palmers site. The impression that Jarrow's problems could be solved thus, without government action, disconcerted the listening marchers. Wilkinson commented that such plans were in the future, and were no substitute for the town's requirement for immediate government intervention.On Wednesday 4 November Wilkinson presented the Jarrow petition to the House of Commons. With over 11,000 signatures, it asked that "His Majesty's Government and this honourable House should realise the urgent need that work should be provided for the town without further delay." In the brief discussion that followed, Runciman said that "the unemployment position at Jarrow, while still far from satisfactory, has improved during recent months", to which James Chuter Ede, the Labour backbencher representing  South Shields, the neighbouring constituency to Wilkinson's, replied that "the Government's complacency is regarded throughout the country as an affront to the national conscience".Blythe summarises the marchers' anger and disillusionment: "And that was that. The result of three months' excited preparation and one month's march has led to a few minutes of flaccid argument during which the Government speakers had hardly mustered enough energy to roll to their feet". A "stay-in" strike was briefly proposed, before Wilkinson arranged a meeting with a cross-party group of MPs. The marchers' case was heard sympathetically; the meeting was warned that, given international uncertainties, they might come to regret the dismantling of an important shipbuilding facility for reasons of private profit. Such statements, according to Wilkinson, made members "distinctly uncomfortable".    The next day the marchers returned by train to Jarrow, where they received an ecstatic welcome from the town. 
Question: What is the name of that which asked "His Majesty's Government and this honourable House should realise the urgent need that work should be provided for the town without further delay"?

Answer: the Jarrow petition.


Question: Passage: 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 nickel was investigated in the 1970s but abandoned in favour of more convenient sources. In suitable locations, diamonds are gathered from the seafloor using suction hoses to bring gravel ashore. In deeper waters, mobile seafloor crawlers are used and the deposits are pumped to a vessel above. In Namibia, more diamonds are now collected from marine sources than by conventional methods on land. 
Question: What forms when geothermally heated water is emitted from deep sea hydrothermal vents?

Answer:
Seafloor massive sulphide deposits.