Problem: Glacier:

Glacial abrasion is commonly characterized by glacial striations. Glaciers produce these when they contain large boulders that carve long scratches in the bedrock. By mapping the direction of the striations, researchers can determine the direction of the glacier's movement. Similar to striations are chatter marks, lines of crescent-shape depressions in the rock underlying a glacier. They are formed by abrasion when boulders in the glacier are repeatedly caught and released as they are dragged along the bedrock.

What charactrerizes glacial striations?
---
A: unanswerable


Problem: Finally, hysteresis synchronous motors typically are (essentially) two-phase motors with a phase-shifting capacitor for one phase. They start like induction motors, but when slip rate decreases sufficiently, the rotor (a smooth cylinder) becomes temporarily magnetized. Its distributed poles make it act like a PMSM. The rotor material, like that of a common nail, will stay magnetized, but can also be demagnetized with little difficulty. Once running, the rotor poles stay in place; they do not drift.
When in operation, what do hysteresis synchronous motors poles do?
---
Answer: stay in place


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
From 1988 to 1997, the BBC and Sky Sports had coverage of the FA Cup, the BBC had highlights on Match of the Day and usually one match per round while Sky had the same deal. From 1997 to 2001, ITV and Sky shared live coverage with both having two matches per round and BBC continuing with highlights on Match of the Day. From 2002 to 2008, BBC and Sky again shared coverage with BBC having two or three matches per round and Sky having one or two. From 2008–09 to 2013–14, FA Cup matches are shown live by ITV across England and Wales, with UTV broadcasting to Northern Ireland but STV refusing to show them. ITV shows 16 FA Cup games per season, including the first pick of live matches from each of the first to sixth rounds of the competition, plus one semi-final exclusively live. The final is also shown live on ITV. Under the same 2008 contract, Setanta Sports showed three games and one replay in each round from round three to five, two quarter-finals, one semi-final and the final. The channel also broadcast ITV's matches exclusively to Scotland, after the ITV franchise holder in Scotland, STV, decided not to broadcast FA Cup games. Setanta entered administration in June 2009 and as a result the FA terminated Setanta's deal to broadcast FA-sanctioned competitions and England internationals. As a result of Setanta going out of business ITV showed the competition exclusively in the 2009–10 season with between three and four matches per round, all quarter finals, semi-finals and final live as the FA could not find a pay TV broadcaster in time. ESPN bought the competition for the 2010–11 to 2012–13 season and during this time Rebecca Lowe became the first woman to host the FA Cup Final in the UK.
What network has never covered the FA Cup?
A: unanswerable


Context and question: This narrative draws on the Nidānakathā of the Jataka tales of the Theravada, which is ascribed to Buddhaghoṣa in the 5th century CE. Earlier biographies such as the Buddhacarita, the Lokottaravādin Mahāvastu, and the Sarvāstivādin Lalitavistara Sūtra, give different accounts. Scholars are hesitant to make unqualified claims about the historical facts of the Buddha's life. Most accept that he lived, taught and founded a monastic order, but do not consistently accept all of the details contained in his biographies.
What do scholars recognize about the life of the Buddha?
Answer: Most accept that he lived, taught and founded a monastic order


Question: Between the 8th and 18th centuries, the use of glazed ceramics was prevalent in Islamic art, usually assuming the form of elaborate pottery. Tin-opacified glazing was one of the earliest new technologies developed by the Islamic potters. The first Islamic opaque glazes can be found as blue-painted ware in Basra, dating to around the 8th century. Another contribution was the development of stone-paste ceramics, originating from 9th century Iraq. Other centers for innovative ceramic pottery in the Old world included Fustat (from 975 to 1075), Damascus (from 1100 to around 1600) and Tabriz (from 1470 to 1550).
Is there an answer to this question: What was a center for innovative ceramic pottery in the 14th and 15th century?

Answer: unanswerable


Question: At the airport, where records have been kept since 1930, the record maximum temperature was 117 °F (47 °C) on June 26, 1990, and the record minimum temperature was 16 °F (−9 °C) on January 4, 1949. There is an average of 145.0 days annually with highs of 90 °F (32 °C) or higher and an average of 16.9 days with lows reaching or below the freezing mark. Measurable precipitation falls on an average of 53 days. The wettest year was 1983 with 21.86 in (555 mm) of precipitation, and the driest year was 1953 with 5.34 in (136 mm). The most rainfall in one month was 7.93 in (201 mm) in August 1955. The most rainfall in 24 hours was 3.93 in (100 mm) on July 29, 1958. Snow at the airport averages only 1.1 in (2.8 cm) annually. The most snow received in one year was 8.3 in (21 cm) and the most snow in one month was 6.8 in (17 cm) in December 1971.
Is there an answer to this question: In what month did Tucson get the most snow?

Answer:
December 1971