Extract the answer to the question from the following context. Question: How long have meteorites been accumulating in Antarctica? Context: Meteorites from Antarctica are an important area of study of material formed early in the solar system; most are thought to come from asteroids, but some may have originated on larger planets. The first meteorite was found in 1912, and named the Adelie Land meteorite. In 1969, a Japanese expedition discovered nine meteorites. Most of these meteorites have fallen onto the ice sheet in the last million years. Motion of the ice sheet tends to concentrate the meteorites at blocking locations such as mountain ranges, with wind erosion bringing them to the surface after centuries beneath accumulated snowfall. Compared with meteorites collected in more temperate regions on Earth, the Antarctic meteorites are well-preserved.
Ans: some may have originated on larger planets

Extract the answer to the question from the following context. Question: What happened to expand tourism in Nepal? Context: With the opening of the tourist industry after the change in the political scenario of Nepal in 1950, the hotel industry drastically improved. Now Kathmandu boasts several luxury such as the Hyatt Regency, Dwarika's, theYak & Yeti, The Everest Hotel, Hotel Radisson, Hotel De L'Annapurna, The Malla Hotel, Shangri-La Hotel (which is not operated by the Shangri-La Hotel Group) and The Shanker Hotel. There are several four-star hotels such as Hotel Vaishali, Hotel Narayani, The Blue Star and Grand Hotel. The Garden Hotel, Hotel Ambassador, and Aloha Inn are among the three-star hotels in Kathmandu. Hotels like Hyatt Regency, De L'Annapurna and Hotel Yak & Yeti are among the five-star hotels providing casinos as well.
Ans: the change in the political scenario

Extract the answer to the question from the following context. Question: How is it found on Earth? Context: Copper is synthesized in massive stars and is present in the Earth's crust at a concentration of about 50 parts per million (ppm), where it occurs as native copper or in minerals such as the copper sulfides chalcopyrite and chalcocite, the copper carbonates azurite and malachite, and the copper(I) oxide mineral cuprite. The largest mass of elemental copper discovered weighed 420 tonnes and was found in 1857 on the Keweenaw Peninsula in Michigan, US. Native copper is a polycrystal, with the largest described single crystal measuring 4.43.23.2 cm.
Ans: native copper or in minerals

Extract the answer to the question from the following context. Question: What kind of labor did students do in their places of education? Context: From the 1950s on, the students were also used for unpaid work at schools, where they cleaned and performed repairs. This practice has continued in the Russian Federation, where up to 21 days of the summer holidays is sometimes set aside for school works. By law, this is only allowed as part of specialized occupational training and with the students' and parents' permission, but those provisions are widely ignored. In 2012 there was an accident near city of Nalchik where a car killed several pupils cleaning up a highway shoulder during their "holiday work" as well as their teacher who was supervising them.
Ans: cleaned and performed repairs