Conical volcanoes, also known as stratovolcanoes, are characterized by their steep, conical shape. They are formed by the eruption of viscous lava that piles up around the vent, creating a tall, narrow structure. These volcanoes often have explosive eruptions due to the buildup of pressure from gas and magma. Common examples of conical volcanoes include Mount St. Helens in the United States and Mount Fuji in Japan. Their eruptions can produce ash, lava flows, and pyroclastic flows, making them some of the most dangerous types of volcanoes. The layers of hardened lava and ash contribute to their distinctive shape.