Which of the following volcanoes is located in the Pacific Ring of Fire?

What is the term for a fast-moving current of hot ash, gas, and rock that flows down the side of a volcano? Which of the following volcanoes is known for its perfectly symmetrical cone shape? Which volcanic feature is formed by the collapse of a volcano's cone? Which of the following volcanoes is located in the Andes mountain range? Which of the following volcanoes is located in the Hawaiian Islands? Which of the following volcanoes is located in the Cascade Range? Which volcano is located in the Philippines and is known for its perfect cone shape? What is the name of the volcanic eruption in Iceland in 2010 that caused widespread air travel disruption?