Another crater lake is on the G.Ijen Volcano, with its high sulphur content, giving water a bluish yellow color. The three color crater in Lombok. There are also submarine volcanoes in the Eastern part of Indonesia. Ashes are also brought by rivers to the floodplains, which are usually cultivated as rice paddies. Thus volcanoes brings benefit to the farmers in the Spice Islands.
Volcanoes are also hazards to man, animals and crops.
Lava flows, a glowing melt of rocks descending from the crater. Earthquakes with magnitudes over 8 in the Richter scale have shaken the islands. These earthquakes originate as great slabs of earthcrust pass along each other along great faults or ride over each other in what geologists call subduction zones. From a natural history point of view the archipelago is also a meeting place of the Australian and Asian fauna and flora. The Sumatra tigers Striped tigers as long as 8 feet still live in the jungles of Sumatra.