Which of the following is a common method used to monitor volcanic activity?

Which of the following is a common gas emitted by volcanoes? What is the name of the famous volcano that erupted in 1815 and caused the 'Year Without a Summer'? Which type of eruption is characterized by a gentle, non-explosive release of lava? Which type of volcano is characterized by its gently sloping shape and is typically formed by the eruption of fluid lav… Which of the following volcanoes is located in the Mediterranean Sea? Which of the following volcanoes is a cinder cone volcano? Which of the following volcanoes is located in the Philippines? Which type of volcano is characterized by a steep conical shape?