Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.

Q: Context: The movie is based on the true story of two British athletes competing in the 1924 Summer Olympics in Paris. Englishman Harold Abrahams (Ben Cross), who is Jewish, overcomes anti-Semitism and class prejudice in order to compete against the "Flying Scotsman", Eric Liddell (Ian Charleson), in the 100 metre race.Opening in 1919 England, Harold Abrahams enters Cambridge University, where he meets with anti-Semitism from the staff, but enjoys participating in the Gilbert and Sullivan theatre club. He becomes the first person to ever complete the Trinity Great Court run: running around the court in the time it takes for the clock to strike 12. Abrahams achieves an undefeated string of victories in various national running competitions. Although focused on his running, he falls in love with a famous Gilbert and Sullivan soprano, Sybil (Alice Krige).Meanwhile in Scotland, Eric Liddell (Ian Charleson), born in China of Scottish missionary parents, is in Scotland. His devout sister Jennie (Cheryl Campbell) disapproves of Liddell's plans to pursue competitive running. But Liddell sees running as a way of glorifying God before returning to China to work as a missionary.Abrahams and Liddell meet for the first time in London in June 1923 when they first race against each other in a British open. Liddell beats Abrahams who takes it extremely badly. But Sam Mussabini (Ian Holm), a professional trainer whom Abrahams had approached earlier, offers to take him on to improve his technique. This attracts criticism from the Cambridge college masters (John Gielgud and Lindsay Anderson). In their meeting with Abrahams, the Cambridge masters allege it is ungentlemanly for an amateur to "play the tradesman" by employing a professional coach. Abrahams realizes this is a cover for their anti-Semitism and class entitlement, and dismisses their concern.Meanwhile, when Liddell accidentally misses a church prayer meeting because of his running, his sister Jennie upbraids him and accuses him of no longer caring about God. But Eric tells her that though he intends to eventually return to the China mission, he feels divinely inspired when running, and that not to run would be to dishonor God: "I believe that God made me for a purpose. But He also made me fast, and when I run, I feel His pleasure."The two athletes, after over a year of training and racing, are accepted to represent Great Britain in the 1924 Summer Olympics in Paris, France. Also accepted are Abrahams' Cambridge buddies, Lord Andrew Lindsay (Nigel Havers), Aubrey Montague (Nicholas Farrell), and Henry Stallard (Daniel Gerroll) whom join the UK team.While boarding the boat to Paris for the Olympics, Liddell learns from the newspapers that the event for his 100 meter race will be on a Sunday. Liddell refuses to run the race despite strong pressure from the Prince of Wales (David Yelland) as well as the head of the British Olympic committee, Lord Cadogan (Patrick Magee) because Liddell's Christian convictions prevent him from running on the Christian Sabbath (Sunday).Hope appears in the form of Liddell's teammate Lord Andrew Lindsay. Having already won a silver medal in the 400 meter hurdles, Lindsay proposes to yield his place in the 400 meter race on the following Tuesday to Liddell. Liddell gratefully agrees. His religious convictions in the face of national athletic pride make headlines around the world.Liddell delivers a sermon at the Paris Church of Scotland that Sunday, and quotes from Isaiah 40, verse 31:"But they that wait upon the LORD shall renew their strength; they shall mount up with wings as eagles; they shall run, and be not weary; and they shall walk, and not faint."Meanwhile, Abrahams is badly beaten by the heavily favored and more experienced United States runner Charles Paddock (Dennis Christopher) in the 200 meter race who wins the gold medal, while Abrahams takes a second place silver medal. Abrahams knows that his last chance for a gold medal will be the 100 meter run. He competes in the 100 meter sprint and wins, beating Paddock and the rest of the Americans.On Tuesday, just before Liddell's race, the American coach remarks to his runners that Liddell has little chance 
 Question: When does the 400-metre race take place?

A: on a tuesday
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Q: Context: Ponds are small bodies of fresh water that usually have no outlet; ponds are often are fed by underground springs. Like lakes, ponds are bordered by hills or low rises so the water is blocked from flowing directly downhill. Lakes are larger bodies of water. Lakes are usually fresh water, although the Great Salt Lake in Utah is just one exception. Water usually drains out of a lake through a river or a stream and all lakes lose water to evaporation. Lakes form in a variety of different ways: in depressions carved by glaciers, in calderas (Figure 1.1), and along tectonic faults, to name a few. Subglacial lakes are even found below a frozen ice cap. As a result of geologic history and the arrangement of land masses, most lakes are in the Northern Hemisphere. In fact, more than 60% of all the worlds lakes are in Canada most of these lakes were formed by the glaciers that covered most of Canada in the last Ice Age (Figure 1.2). Lakes are not permanent features of a landscape. Some come and go with the seasons, as water levels rise and fall. Over a longer time, lakes disappear when they fill with sediments, if the springs or streams that fill them diminish, (a) Crater Lake in Oregon is in a volcanic caldera. Lakes can also form in volcanic craters and impact craters. (b) The Great Lakes fill depressions eroded as glaciers scraped rock out from the landscape. (c) Lake Baikal, ice coated in winter in this image, formed as water filled up a tectonic faults. Lakes near Yellowknife were carved by glaciers during the last Ice Age. or if their outlets grow because of erosion. When the climate of an area changes, lakes can either expand or shrink (Figure 1.3). Lakes may disappear if precipitation significantly diminishes. Large lakes have tidal systems and currents, and can even affect weather patterns. The Great Lakes in the United States contain 22% of the worlds fresh surface water (Figure 1.1). The largest them, Lake Superior, has a tide that rises and falls several centimeters each day. The Great Lakes are large enough to alter the weather system in Northeastern United States by the lake effect, which is an increase in snow downwind of the relatively warm lakes. The Great Lakes are home to countless species of fish and wildlife. Many lakes are not natural, but are human-made. People dam a stream in a suitable spot and then let the water back up behind it, creating a lake. These lakes are called "reservoirs." Click image to the left or use the URL below. URL: 
 Question: which of these is not full of fresh water?

A: the great salt lake
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Q: Context: Air temperature changes as altitude increases. In some layers of the atmosphere, the temperature decreases. In other layers, it increases. You can see this in Figure 15.12. Refer to this figure as you read about the layers below. The troposphere is the lowest layer of the atmosphere. In it, temperature decreases with altitude. The troposphere gets some of its heat directly from the Sun. Most, however, comes from Earths surface. The surface is heated by the Sun and some of that heat radiates back into the air. This makes the temperature higher near the surface than at higher altitudes. Look at the troposphere in Figure 15.12. This is the shortest layer of the atmosphere. It rises to only about 12 kilometers (7 miles) above the surface. Even so, this layer holds 75 percent of all the gas molecules in the atmosphere. Thats because the air is densest in this layer. Air in the troposphere is warmer closer to Earths surface. Warm air is less dense than cool air, so it rises higher in the troposphere. This starts a convection cell. Convection mixes the air in the troposphere. Rising air is also a main cause of weather. All of Earths weather takes place in the troposphere. Sometimes air doesnt mix in the troposphere. This happens when air is cooler close to the ground than it is above. The cool air is dense, so it stays near the ground. This is called a temperature inversion. An inversion can trap air pollution near the surface. Temperature inversions are more common in the winter. Can you explain why? At the top of the troposphere is a thin layer of air called the tropopause. You can see it in Figure 15.12. This layer acts as a barrier. It prevents cool air in the troposphere from mixing with warm air in the stratosphere. The stratosphere is the layer above the troposphere. The layer rises to about 50 kilometers (31 miles) above the surface. Air temperature in the stratosphere layer increases with altitude. Why? The stratosphere gets most of its heat from the Sun. Therefore, its warmer closer to the Sun. The air at the bottom of the stratosphere is cold. The cold air is dense, so it doesnt rise. As a result, there is little mixing of air in this layer. The stratosphere contains a layer of ozone gas. Ozone consists of three oxygen atoms (O3 ). The ozone layer absorbs high-energy UV radiation. As you can see in Figure 15.14, UV radiation splits the ozone molecule. The split creates an oxygen molecule (O2 ) and an oxygen atom (O). This split releases heat that warms the stratosphere. By absorbing UV radiation, ozone also protects Earths surface. UV radiation would harm living things without the ozone layer. At the top of the stratosphere is a thin layer called the stratopause. It acts as a boundary between the stratosphere and the mesosphere. The mesosphere is the layer above the stratosphere. It rises to about 85 kilometers (53 miles) above the surface. Temperature decreases with altitude in this layer. There are very few gas molecules in the mesosphere. This means that there is little matter to absorb the Suns rays and heat the air. Most of the heat that enters the mesosphere comes from the stratosphere below. Thats why the mesosphere is warmest at the bottom. Did you ever see a meteor shower, like the one in Figure 15.15? Meteors burn as they fall through the mesosphere. The space rocks experience friction with the gas molecules. The friction makes the meteors get very hot. Many meteors burn up completely in the mesosphere. At the top of the mesosphere is the mesopause. Temperatures here are colder than anywhere else in the atmosphere. They are as low as -100 C (-212 F)! Nowhere on Earths surface is that cold. The thermosphere is the layer above the mesosphere. It rises to 600 kilometers (372 miles) above the surface. The International Space Station orbits Earth in this layer as in Figure 15.16. Temperature increases with altitude in the thermosphere. Surprisingly, 
 Question: The shortest layer of the atmosphere is the

A:
troposphere.
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