Geography
Enewetak Atoll formed atop a seamount. The seamount was formed in the late Cretaceous (about 75.8 million years ago). This seamount is now about 4,600 feet (1,400 m) below sea level. The seamount is made of basalt, and its depth is due to a general subsidence of the entire region and not because of erosion.
Enewetak has a mean elevation above sea level of 10 feet (3.0 m).
Read more about this topic: Enewetak Atoll
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