Earthquakes and tsunamis are caused by pressure building up in the Earth's crust along the intersection of tectonic plates, while tornadoes are created by updrafts and downdrafts interacting with wind.
By reducing the need for fossil fuels through the use of the ethanol biofuel.
A. Convicts
The reason why convicts is the correct answer is because people were at first sent to Australia with the sole reason of serving their sentence there. For that reason, a great proportion of people at the time were simply convicts.
1884 and 1914
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