Find expert answers and community-driven knowledge on IDNLearn.com. Join our community to receive prompt and reliable responses to your questions from knowledgeable professionals.
Blue holes are caves that are (1) underwater / high up in the mountains. They were formed millions of years ago when (2) huge earthquakes happened / the land above them fell in and water entered the space. Blue holes are located on land or in the sea. Many of them are very deep and the water inside the holes is usually very (3) rough / calm. Although exploring blue holes is dangerous, many scientists still risk their lives to dive into them. They think that blue holes can tell us a lot about (4) ancient life forms / how the oceans were formed.
Your participation is crucial to us. Keep sharing your knowledge and experiences. Let's create a learning environment that is both enjoyable and beneficial. Discover insightful answers at IDNLearn.com. We appreciate your visit and look forward to assisting you again.
