A stratovolcano, forby kent as a composite volcano, is a conical volcano biggit up bi mony layers (strata) o hairdened lava, tephra, pumice, an volcanic ash. Unalik shield volcanoes, stratovolcanoes are characterised bi a stey profile an periodic explosive eruptions an quiet eruptions, tho thare some wi collapsed craters cried calderas. The lava that rins frae stratovolcanoes teepically cuils an hairdens afore spreadin far due tae heich viscosity. The magma furmin this lava is aften felsic, haein heich-tae-intermediate levels o silica (as in rhyolite, dacite, or andesite), wi lesser amoonts o less-viscous mafic magma. Extensive felsic lava flows is uncommon, but haes traivelt as far as 15 km (9.3 mi).
Stratovolcanoes is whiles cried "composite volcanoes" acause o thair composite layered structure biggit up frae sequential ootpourins o eruptive materials. Thay are amang the maist common kins o volcano, in contrast tae the less common shield volcanoes. Twa famous stratovolcanoes is Krakatoa, best kent for its catastrophic eruption in 1883 an Vesuvius, famous for its destruction o the touns Pompeii an Herculaneum in 79 AD. Baith eruptions claimed thoosands o lifes.
References[eedit | eedit soorce]
- This airticle incorporates public domain material frae the United States Geological Survey document: "Principal Types of Volcanoes". Retrieved 19 Januar 2009.
- "Garibaldi volcanic belt: Garibaldi Lake volcanic field". Catalogue of Canadian volcanoes. Geological Survey of Canada. 1 Apryle 2009. Retrieved 27 Juin 2010.
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