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Divergent Boundaries- East Africa rift in Kenya and Ethiopia, and the Rio Grande rift in New Mexico- the boundary between tectonic plates that are moving away from each other.
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Rift Valley- East African Rift-an elongated valley formed by the depression of a block of the earth's crust between two faults or groups of faults of approximately parallel orientation.
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Mid-ocean ridge- Mid Atlantic Ridge-it is a long, undersea mountain chain that has a steep, narrow valley at its center, that forms as magma rises from the asthenosphere , and that creates new oceanic lithosphere (sea floor) as tectonic plates moves apart.