basalt

Basalt is a dark-colored, dense volcanic rock formed from rapidly cooled lava. It is rich in minerals like magnesium and iron, giving it its characteristic dark appearance. Basalt is commonly found on Earth's surface, especially in oceanic crust and volcanic regions, and is often used in construction and as an aggregate in concrete. Its formation from cooled lava makes it an essential component of Earth's geology, representing volcanic activity and the Earth's outer layer's volcanic processes.