A stratovolcano, an aa kent as a composite volcano, is a conical volcano biggit up bi mony layers (strata) o hairdened lava, tephra, pumice, an volcanic ash. Unlik shield volcanoes, stratovolcanoes are characterized bi a steep profile an periodic explosive eruptions an quiet eruptions, altho thare are some wi collapsed craters cried calderas. The lava that flows frae stratovolcanoes typically cuils an hairdens afore spreadin far due tae heich viscosity. The magma furmin this lava is eften felsic, havin heich-tae-intermediate levels o silica (as in rhyolite, dacite, or andesite), wi lesser amoonts o less-viscous mafic magma. Extensive felsic lava flows are uncommon, but hae travelled as far as 15 km (9.3 mi).
Stratovolcanoes are sometimes cried "composite volcanoes" acause o thair composite layered structure biggit up frae sequential ootpourins o eruptive materials. Thay are amang the maist common types o volcanoes, in contrast tae the less common shield volcanoes. Twa famous stratovolcanoes are 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 lives.
References[eedit | eedit soorce]
- This airticle incorporates public domain material frae the United States Geological Survey document: "Principal Types of Volcanoes". Retrieved 2009-01-19.
- "Garibaldi volcanic belt: Garibaldi Lake volcanic field". Catalogue of Canadian volcanoes. Geological Survey of Canada. 2009-04-01. Retrieved 2010-06-27.