In popular parlance, discussions of colonialism in Africa usually focus on the European conquests of the New Imperialism and the Scramble for Africa (1884-1914) era, followed by gradual decolonisation. The principal powers involved in the modern colonisation of Africa are Britain, France, Germany, Portugal, and Italy.
The movement of tectonic plates causes a variety of geological changes, the most obvious of which would be earthquakes. These plates are pretty big, and when they scrape along the top of the earth, they can cause quite the seismological tremors.
Also, they can generate either trenches or mountain ranges along faults (the cracks between two plates).
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The greenhouse effect is related to the increase in the average surface temperature which is considered "global warming". Global warming is the result of an increase in gases like methane, carbon dioxide, and other factors that lead to a rise in the planet's temperature.
C. An abundance of oil allowed humans to concentrate on other power technologies