The Big Island of Hawaii is an active volcanic island. The whole island consists of five volcanoes. Hawaii's Black Beach, the famous Punaluu Black Beach, was created by volcanoes. As a result of volcanic eruptions, hot lava flows into the sea. Under the cooling of sea water, the crust of lava rapidly cakes and hardens, while the sea water becomes a large amount of superheated steam due to heating, which makes the crust of lava flow collapse and become fragments because it can not withstand the steam tension. After years of erosion and polishing by sea water, it eventually turned into a delicate piece of black sand. Because all the beaches we saw in the past were yellow or white beaches, suddenly we saw the dark black beach, and we didn't realize it was shining in front of us. What a peculiar beach landscape! Black rocks take the place of white beaches, clear water, shiny rocks, charming - one of the highlights of the peculiar scenery of Oshima.