Volcanoes

The natureof volcanoes
==volcanoes are mountains but they are very different from other mountains. They are formed by folding and crumpling but by uplift and erosion. A volcano is most commonly a conical hill or mountain built around a vent that connects with reservoirs of molten rock below the surface of the earth. The term volcano also refers to the opening or vent through which the molte rock and associated gases are expelled. If so, an eruption begins, and the molten rock may pour from the vent as non-explosive lava flows, or if may shoot violently into the air as dense clouds of lava fragments.==

Three Volcanoes[[image:thumbnail.jpg align="left"]]
==Mount semeru, seen with an ash plume, is the highest volcano on the indonesian island of java and has been in a constant eruptionsince 1967. It lies at the southern end of the tengger caldera which contains smaller volcanoes mount bromo and mount batok and several other.==