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.
Probably the world's two most famous sea caves are the Blue Grotto on the Italian island of Capri (left), and Fingal's Cave on the British island of Staffa (formed in columnar basalt).egions where sea caves form are often associated with arches and sea stacks. Often these are remnants from collapses of sea caves, and in some cases may line up along what had been a fault line in a rock unit that has been carved by the sea into isolated stacks of rock.