Click on each statement that is true, according to the passage. Leave all untrue statements unchecked. The Grand Canyon is considered one of the natural wonders of the world.
The Great Blue Hole was initially formed during the Ice Age.
There is no significant change in oxygen levels within the depths of the Great Blue Hole.
The deepest part of the Great Blue Hole is around 200 feet deep.
The Great Blue Hole has not yet been designated a national monument by the nation of Belize.
The Great Blue Hole is now a place commonly visited by visitors to the region.
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