The Great Rift Valley of East Africa is characterized by____________ .
A) mainly transform faulting along zones connecting the rift with the Red Sea
B) a belt of anticlinal and synclinal folding formed by Africa's collision with Madagascar
C) a valley formed from a series of grabens, nearly 6000 km long and flanked by tilted horsts, formed mainly by normal faulting as East Africa begins to split apart
D) mainly thrust faulting as Africa collides with Arabia
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