Nan Madol:Nan Madol is an ancient city built using basalt boulders. These rocks were carefully arranged to form platforms, walls, and other architectural elements.
Stone construction: Stone construction refers to building techniques that utilize stones as the primary material. Basalt boulders played a crucial role in the stone construction of Nan Madol.
Lava: Lava is molten rock that erupts from volcanoes during volcanic activity. When it cools down and solidifies, it forms different types of rocks, including basalt which makes up basalt boulders.