Introduction to Plate Tectonics The Earth's upper, rigid layer is broken into several plates which are in constant motion to one another. Most earthquakes and volcanoes occur as result of these plate boundaries.
Volcanoes & Spices This 17-days adventurous expedition is one of our most exciting volcano tours! Visit Halmahera, North Sulawesi and the Sangihe Islands with some of Indonesia's most active volcanoes, including Dukono, Ibu, Lokon, Soputan and Karangetang.