The name for such a hole is "caldera" which is a word of Spanish origin meaning "a pot" or a "cooking pot" (thing of cauldron!) - and this word is used because it resembles the shape of this hole.
Often the Calderas are filled with water forming lakes and often there is an island in the middle of the water.
Answer:
Egypt, as Herodotus wrote, is the Gift of the Nile. ... No Nile, no Egypt. It's that simple. But the Nile isn't Egypt's alone: its flow, and those of its tributaries, also waters the soils, and is fed by the rivers, of Sudan, Ethiopia, and several other African nations.
Explanation
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It would be sonar i think
B, government is the answer
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