The North and South Americans contients are moving away from Africa esimated at 1cm to 10 cm per year. That means that if the earth was 6000 years old x 10cm (take the biggest amount)/year = 60,000 cm's. Converting this to km = .6 km. That means that if you live on the west coast of Africa you should be able to throw a rock onto South America; if the Earth is 6,000 years old.
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