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Sichuan consists of two geographically very distinct parts. The eastern part of the province is mostly within the fertile Sichuan basin (which is shared by Sichuan with Chongqing Municipality). The western Sichuan consists of the numerous mountain ranges forming the easternmost part of the Qinghai-Tibet Plateau, which are known generically as Hengduan Mountains. One of these ranges, Daxue Mountains, contains the highest point of the province Gongga Shan, at 7,556 metres (24,790 ft) above sea level.

What makes up majority of the eastern Sichuan province?
Answer: Sichuan basin
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Film speed is used in the exposure equations to find the appropriate exposure parameters. Four variables are available to the photographer to obtain the desired effect: lighting, film speed, f-number (aperture size), and shutter speed (exposure time). The equation may be expressed as ratios, or, by taking the logarithm (base 2) of both sides, by addition, using the APEX system, in which every increment of 1 is a doubling of exposure; this increment is commonly known as a "stop". The effective f-number is proportional to the ratio between the lens focal length and aperture diameter, the diameter itself being proportional to the square root of the aperture area. Thus, a lens set to f/1.4 allows twice as much light to strike the focal plane as a lens set to f/2. Therefore, each f-number factor of the square root of two (approximately 1.4) is also a stop, so lenses are typically marked in that progression: f/1.4, 2, 2.8, 4, 5.6, 8, 11, 16, 22, 32, etc.

What variables help the photographer produce the desired effect?
Answer: lighting, film speed, f-number (aperture size), and shutter speed (exposure time)
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Following the start of the Arab Spring in 2011, Gaddafi spoke out in favour of Tunisian President Zine El Abidine Ben Ali, then threatened by the Tunisian Revolution. He suggested that Tunisia's people would be satisfied if Ben Ali introduced a Jamahiriyah system there. Fearing domestic protest, Libya's government implemented preventative measures, reducing food prices, purging the army leadership of potential defectors and releasing several Islamist prisoners. They proved ineffective, and on 17 February 2011, major protests broke out against Gaddafi's government. Unlike Tunisia or Egypt, Libya was largely religiously homogenous and had no strong Islamist movement, but there was widespread dissatisfaction with the corruption and entrenched systems of patronage, while unemployment had reached around 30%.

On what date in 2011 did protests begin in Libya?
Answer:
17 February