Problem: During the 19th and 20th centuries there was a major dispute known as the Greek language question, on whether the official language of Greece should be the archaic Katharevousa, created in the 19th century and used as the state and scholarly language, or the Dimotiki, the form of the Greek language which evolved naturally from Byzantine Greek and was the language of the people. The dispute was finally resolved in 1976, when Dimotiki was made the only official variation of the Greek language, and Katharevousa fell to disuse.
What language was made the only official variation in 1976?
The answer is the following: Dimotiki

Problem: The French Marines and naval infantry intended for the invasion of northern Germany were dispatched to reinforce the French Army of Châlons and fell into captivity at Sedan along with Napoleon III. A shortage of officers, following the capture of most of the professional French army at the Siege of Metz and at the Battle of Sedan, led naval officers to be sent from their ships to command hastily assembled reservists of the Garde Mobile. As the autumn storms of the North Sea forced the return of more of the French ships, the blockade of the north German ports diminished and in September 1870 the French navy abandoned the blockade for the winter. The rest of the navy retired to ports along the English Channel and remained in port for the rest of the war.
On which rough date did the French navy abandon their blockade?
The answer is the following: September 1870

Problem: Modern geology, like modern chemistry, gradually evolved during the 18th and early 19th centuries. Benoît de Maillet and the Comte de Buffon saw the Earth as much older than the 6,000 years envisioned by biblical scholars. Jean-Étienne Guettard and Nicolas Desmarest hiked central France and recorded their observations on some of the first geological maps. Aided by chemical experimentation, naturalists such as Scotland's John Walker, Sweden's Torbern Bergman, and Germany's Abraham Werner created comprehensive classification systems for rocks and minerals—a collective achievement that transformed geology into a cutting edge field by the end of the eighteenth century. These early geologists also proposed a generalized interpretations of Earth history that led James Hutton, Georges Cuvier and Alexandre Brongniart, following in the steps of Steno, to argue that layers of rock could be dated by the fossils they contained: a principle first applied to the geology of the Paris Basin. The use of index fossils became a powerful tool for making geological maps, because it allowed geologists to correlate the rocks in one locality with those of similar age in other, distant localities. Over the first half of the 19th century, geologists such as Charles Lyell, Adam Sedgwick, and Roderick Murchison applied the new technique to rocks throughout Europe and eastern North America, setting the stage for more detailed, government-funded mapping projects in later decades.
Jean-Etienne Guettard and NIcolas Desmarest went to France and recorded what?
The answer is the following: the first geological maps

Problem: In Germany, groups such as Einstürzende Neubauten developed a unique style of industrial music, utilizing avant-garde noise, homemade instruments and found objects. Members of that group would later go on to collaborate with members of the Birthday Party. In Brazil, the post-punk scene grew after the generation of Brasilia rock with bands such as Legião Urbana, Capital Inicial and Plebe Rude and then the opening of the music club Madame Satã in São Paulo, with acts like Cabine C, Titãs, Patife Band, Fellini and Mercenárias, as documented on compilations like The Sexual Life of the Savages and the Não Wave/Não São Paulo series, released in the UK, Germany and Brazil, respectively.[citation needed]
Where did some groups develop a unique style of industrial music?
The answer is the following:
Germany