Forming a chemical bond releases energy and therefore is an exothermic process. Exothermic reactions usually feel hot because it is giving heat to you. Endothermic-a process or reaction that absorbs energy in the form of heat. Breaking a chemical bond requires energy and therefore is Endothermic.
karma level 71199. The Seikan Tunnel is a 53.85 km (33.46 mi) railway tunnel in Japan, with a 23.3-kilometre (14.5 mi) long portion under the seabed. Track level is about 140-metre (460 ft) below seabed and 240-metre (790 ft) below sea level. It is the longest undersea tunnel in the world, although the Channel Tunnel between the United Kingdom and France has a longer under-sea portion.
The deepest holes in the world. Whether they're man-made mines or natural sinkholes, these massive holes around the world are anything but the pits. 1. Deanâs Blue Hole: Long Island, Bahamas. At more than 650 feet deep, Deanâs Blue Hole is the worldâs deepest sinkhole with an entrance below water. Located in a bay near Clarence Town on the Bahamasâ Long Island, its visible diameter is roughly 82â115 feet.