What type of geological formation is the Great Blue Hole?
A Marine sinkhole
B Underwater volcano
C Coral island
Correct Answer: Marine sinkhole
Fact: The Great Blue Hole is a marine sinkhole that formed when an ancient limestone cave system collapsed and was submerged as sea levels rose during the last ice age. Over thousands of years, rising oceans flooded the caves, creating the massive, circular sinkhole we see today. Its formation reveals a fascinating glimpse into Earth’s geological history.