Problem: Antarctica:

Vinson Massif, the highest peak in Antarctica at 4,892 m (16,050 ft), is located in the Ellsworth Mountains. Antarctica contains many other mountains, on both the main continent and the surrounding islands. Mount Erebus on Ross Island is the world's southernmost active volcano. Another well-known volcano is found on Deception Island, which is famous for a giant eruption in 1970. Minor eruptions are frequent and lava flow has been observed in recent years. Other dormant volcanoes may potentially be active. In 2004, a potentially active underwater volcano was found in the Antarctic Peninsula by American and Canadian researchers.

Who found the forst underwater volcano?
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A: unanswerable

Problem: As of the census of 2000, there were 197,790 people, 84,549 households, and 43,627 families residing in the city. The population density was 3,292.6 people per square mile (1,271.3/km). There were 92,282 housing units at an average density of 1,536.2 per square mile (593.1/km). The racial makeup of the city was 38.3% White, 57.2% African American, 0.2% Native American, 1.3% Asian, 0.1% Pacific Islander, 1.5% from other races, and 1.5% from two or more races. Hispanic or Latino of any race were 2.6% of the population.
In 2000, how many families lived in Richmond?
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Answer: 43,627

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Deep house's origins can be traced to Chicago producer Mr Fingers's relatively jazzy, soulful recordings "Mystery of Love" (1985) and "Can You Feel It?" (1986). According to author Richie Unterberger, it moved house music away from its "posthuman tendencies back towards the lush" soulful sound of early disco music.
what producer was the first to produce deep house?
A: Mr Fingers

Context and question: Geography effects solar energy potential because areas that are closer to the equator have a greater amount of solar radiation. However, the use of photovoltaics that can follow the position of the sun can significantly increase the solar energy potential in areas that are farther from the equator. Time variation effects the potential of solar energy because during the nighttime there is little solar radiation on the surface of the Earth for solar panels to absorb. This limits the amount of energy that solar panels can absorb in one day. Cloud cover can effect the potential of solar panels because clouds block incoming light from the sun and reduce the light available for solar cells.
Why does time have an effect of the amount of available solar energy?
Answer: during the nighttime there is little solar radiation on the surface of the Earth for solar panels to absorb

Question: Older letters of the Russian alphabet include , which merged to (/je/ or /e/); and , which both merged to (/i/); , which merged to (/f/); , which merged to (/u/); , which merged to (/ju/ or /u/); and /, which later were graphically reshaped into and merged phonetically to /ja/ or /a/. While these older letters have been abandoned at one time or another, they may be used in this and related articles. The yers and originally indicated the pronunciation of ultra-short or reduced /u/, /i/.
Is there an answer to this question: What did the ja or a originally indicate the pronunciation of?

Answer: unanswerable

Question: The chemical composition of wood varies from species to species, but is approximately 50% carbon, 42% oxygen, 6% hydrogen, 1% nitrogen, and 1% other elements (mainly calcium, potassium, sodium, magnesium, iron, and manganese) by weight. Wood also contains sulfur, chlorine, silicon, phosphorus, and other elements in small quantity.
Is there an answer to this question: What approximate percentage of carbon does wood have?

Answer:
50%