br-eathing:malformalady:Long Island sits at the southern end of the Bahamas and has the 2nd deep
br-eathing: malformalady: Long Island sits at the southern end of the Bahamas and has the 2nd deepest blue hole in the world, nestled on the shore. Also known as Dean’s Hole, it plnuges more than 600ft. into darkness. Blue holes are the result of erosion in which water breaks down rock. Rain falling thousands of years ago contained chemicals which slowly wore away at the limestone landmass. These holes later filled with sea water as the sea level changed. The rising and falling of sea levels and the mixture of salt and fresh water further wore away at these cave formations. Blue holes are vertical caves. But they can also have horizontal cave formations that may be hundreds of meters long. Photo credit: Wes C. Skiles, National Geographic See I’m learning science on tumblr mum it’s fine -- source link