The range of 60-70 decibels sound pressure level is about as loud as normal conversation in 1 meter distance.
Flammable, Radioactive Sinkholes. Lesser known in the mainstream media, however, is frackingâs link to massive sinkholes appearing overnight and leaking radiation across the nation.
1. Great Blue Hole, Belize â The first sinkhole in the list, and by far the most amazing is the Great Blue Hole. It is a large submarine sinkhole off the coast of Belize. The hole is circular in shape, over 300 m (984 ft) across and 124 m (407 ft) deep.