The orgins of Jejudo.(제주도의 기원)

[해설사 이상현]

The mother nature determined  to make a beautiful and  unique island( now we call Jeju) In the world 1.6 million ago.
The location she chose to build was an unfamiliar situation for building something.
It is located in the Pacific Ocean at a depth of about 100 meters, 100 miles from the Korean Peninsula.
As if in the early stages of a festival, a volcano erupted beneath the sea.
A series of volcanic eruptions followed. The explosion erupted bombs and chunks of lava and piled them up on the ground around the vent.Now it is called Seogwipo sedimentary layer.As if a whale had risen out of the sea, the foundation of Jejudo 60 million years ago appeared above the water. This land mass can be called Jejudo Island. To be more precise, it is the original Jejudo .The nature gods did not stop there. More than 360 volcanoes erupted here and there. Low-density lava from the craters traveled long distances and over a wide area to create the Jejudo Plateau.
As if making the island more beautiful,
between 0.4 and 1.2 million years ago, two volcanoes erupted in the shallow seafloor at the eastern and southwestern ends of Jejudo, forming two volcanic cones called Seongsan Ilchulbong and Songaksan, respectively. The former is a typical tuff cone formed by aqueous volcanic eruptions.

25,000 years ago, in Mother Nature's final act, a volcano erupted in the center of the island. The explosion created a crown-like volcanic crater in the center of Jeju Island. Now it is called Baekrokdam. Jejudo Island is the youngest land mass in Korea.
Volcanic activity occurred in Jejudo as recently as 1,000 years ago, and it has been dormant since then.
Unlike Japan, Jeju's volcanic activity is not related to plate tectonics.
Hallasan Mountain Natural Reserve, Geomunoreum Lava Tube System, Seongsan Ilchulbong Tuff Cone. These three areas known as ‘Jeju Volcanic Island and Lava Tubes’ were selected unanimously by the World Heritage Committee as the first World Natural Heritage Site in South Korea.