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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.
Volcano Trekking A physically active tour to visit and climb some of Indonesia's most active and famous volcanoes: Papandayan and Galunggung in West Java, Merapi in Central Java, Kelud, Semeru, Bromo, the Tengger caldera, and Ijen in East Java.