What is the name of the largest volcanic caldera in Indonesia?

Which of the following volcanoes is located in the Galapagos Islands, Ecuador? Which type of volcanic eruption is characterized by the interaction of magma and water? What is the name of the volcano that is the highest peak in Japan? Which igneous rock forms from the slow cooling of magma deep underground? What is the name of the largest active volcano on Earth, located in Hawaii? Which of the following countries has the highest number of active volcanoes? What is the name of the volcanic island that was formed in 1963 off the coast of Iceland? What is the name of the volcanic island that was devastated by the 1815 eruption of Mount Tambora?