火山爆发、珊瑚生长、海水上升以及流沙堆积,都能形成新的岛屿。在海洋深处,一座火山爆发了。熔岩冷却,硬化成为岩石。岩石不断堆积,露出了海面。火山就这样一次又一次地喷发。每喷发一次,熔岩就被堆积得更高。慢慢地,这些岩石形成了山峰。很久之后,山峰露出了海面,一座岛屿诞生了。岛屿是被水包围的一种地貌。火山可以创造岛屿,珊瑚礁和沙丘 Volcanic eruptions, coral growth, rising seawater and quicksand accumulation can all form new islands. In the depths of the ocean, a volcano erupted. Lava cools and hardens into rocks. Rocks keep accumulating, revealing the sea. The volcano erupted like this again and again. Each eruption, the lava is stacked higher. Slowly, these rocks form a mountain. A long time later, the mountain peak was exposed to the sea, an island was born. The island is a landscape surrounded by water. Volcanoes create islands, coral reefs and sand dunes