Europe and America used slaves for labor so the slaves in America or Europe are subtracted from the South African population.
Answer:
volcanoes and rivers
Explanation:
the salt from the ocean come from fresh water rivers , and volcanic eruptions spew out water vapor and and carbon dioxide and other gasses like chlorine. the chlorine will then dissolve into the ocean and combine with sodium to get sodium chloride.
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A Syncline is where lays of rock bend downwards and then curve up.
An Anticline is the opposite: layers of rock bend upwards and then down.
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The answer is A natural boundary
