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Unformatted text preview: surface where they cool, solidify and grow into the larger mineral crystals of plutonic rocks such as granite-In low viscosity basalt magma, steam escapes easily and magma is low in dissolved water content-High viscosity rhyolite magma rises and steam bubbles form – they have difficulty escaping from the gooey magma and have to burst their way out How do these characteristics influence eruptions? How are magmas produced in the earth’s crust and mantle? Forms of difference volcanoes Why do volcanoes have different forms? Types of Lava How do lava types vary from each other? Where do volcanoes occur?...
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- Fall '06
- Volcano, Basalt