Answer: Desertification
Explanation:
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Scientists can't tell that an earthquake is a foreshock until the larger earthquake happens. The largest, main earthquake is called the mainshock. Mainshocks always have aftershocks that follow. These are smaller earthquakes that occur afterwards in the same place as the mainshock.
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1. Tectonic
2. Subtropical
3. Aborigine
4. Desalination
Europe and America used slaves for labor so the slaves in America or Europe are subtracted from the South African population.
