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Smallpox has had a major impact on world history, not least because indigenous populations of regions where smallpox was non-native, such as the Americas and Australia, were rapidly decimated and weakened by smallpox. During the 18th century the disease killed an estimated 400,000 Europeans each year, including five reigning monarchs, and was responsible for a third of all blindness. After successful vaccination campaigns throughout the 19th and 20th centuries, the WHO certified the global eradication of smallpox in December 1979. Smallpox is one of two infectious diseases to have been eradicated.
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Answer:By far the most abundant volcanic gas is water vapor, which is harmless. However, significant amounts of carbon dioxide, sulfur dioxide, hydrogen sulfide and hydrogen halides can also be emitted from volcanoes
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Answer:
East European Plain is the largest physical feature in Europe and it is where most crops are grown.
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Europe is part of the Eurasian continental mass, appearing as a huge peninsula of it. It is part of this landmass that in some parts is tectonically highly active, while in some parts it is very calm and without internal disturbances. This has caused the formation of multiple different physical features that often define a region.
The largest physical feature is located in an area that doesn't experience any particular tectonic activity. This physical feature is the East European Plain. It is stretching from Poland to the Ural Mountains west to east, with the Baltic Sea and Finland marking its northern boundary, and the Carpathians, Black Sea, and the Caucasus Mountains marked its southern boundary. This plain os often referred to as Russian Plain as well, and it also has to be taken into consideration that it is actually connected with the North European Plain and French Plain, so it can comfortably be said that this system of plains actually stretches from the Atlantic coast to the Ural Mountains. Being a lowland area with highly fertile soil, it is the region in Europe that is most used for agriculture and it is where the majority of the crops are produced.
B. how similar geological features could be continued from one continent to another.
