Multiple choice general knowledge

What is blue Hole?

  1. Opposite to Black Hole

  2. Limestone cave

  3. Core of Universe

  4. Lake
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A blue hole is a large underwater sinkhole or cave formation, typically formed in limestone or carbonate rock. They get their name from the deep blue color of the water inside compared to the surrounding shallower waters. The Great Blue Hole in Belize is a famous example.

Keep practicing — related questions