The Gulf of Aden is an eastward continuation of the rift-before the rift opened, the Arabian Peninsula was attached to the Horn of Africa-and from this point the rift extends southeastward as part of the mid-oceanic ridge of the Indian Ocean. The Afar Triangle or Danakil Depression of Ethiopia and Eritrea is the probable location of a triple junction, which is possibly underlain by a mantle plume (an upwelling of abnormally hot rock within the earth's mantle that helps the earth to lose heat). The southern end of the Red Sea marks a fork in the rift. The Great Rift Valley is such a significant physical feature on the earth that it is clearly visible from space
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