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stratovolcano

A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava, tephra, pumice, and volcanic ash. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile and periodic explosive eruptions and effusive eruptions, although some have collapsed craters called calderas. The lava flowing from stratovolcanoes typically cools and hardens before spreading far due to high viscosity. The magma forming this lava is often felsic, having high-to-intermediate levels of silica (as in rhyolite, dacite, or andesite), with lesser amounts of less-viscous mafic magma. Extensive felsic lava flows are uncommon, but have travelled as far as 15 km (9.3 mi). Stratovolcanoes are sometimes called "composite volcanoes" because of their composite layered structure built up from sequential outpourings of eruptive materials. They are among the most common types of volcanoes, in contrast to the less common shield volcanoes. Two famous stratovolcanoes are Krakatoa, best known for its catastrophic eruption in 1883 and Vesuvius, famous for its destruction of the towns Pompeii and Herculaneum in 79 CE. Both eruptions claimed thousands of lives. In modern times, Mount Saint Helens and Mount Pinatubo have erupted catastrophically. Existence of stratovolcanoes has not been proved on other terrestrial bodies of the solar system with one exception.
Caucasus. Mount Ararat. - Caucasus. Mount Ararat. Armenia.
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Caucasus. Mount Ararat.

Added 10 days ago by Zeta

38

Volcano.. - Tea fields in front of the volcano.
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Volcano..

Added 3 months ago by Grażyna

126

mountain in the clouds - mountain peak in the clouds
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mountain in the clouds

Added 4 months ago by sandra

50

landscape - colorful puzzle puzzle
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landscape

Added year ago by natalia

59

Olimp in the clouds - Olimp in the clouds, Greece
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Olimp in the clouds

Added year ago by Zeta

134

Mount Fuji, Japan - colorful puzzle jigsaw
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Mount Fuji, Japan

Added year ago by natalia

113

full moon - mountains in the moonlight
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full moon

Added year ago by ewunia x

250

wybuch wulkanu - skała,wulkan,ogień,otwór,
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wybuch wulkanu

Added over a year ago by wieslawa

152

wybuch wulkanu - lawa,wulkan,góry,fala,woda
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wybuch wulkanu

Added over a year ago by wieslawa

139

wulkan Etna - wybuch wulkanu Etna naSycyli
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wulkan Etna

Added over a year ago by Basieńka

291

piękne miejsca na ziemi - piękne miejsca na ziemi
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piękne miejsca na ziemi

Added over a year ago by Nikola

329

Ośnieżone szczyty - Ośnieżone szczyty w tle
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Ośnieżone szczyty

Added over a year ago by Anita

82

Vulkan Tolbachik - Vulkan Tolbachik auf die russische Halbinsel Kamtaschatka
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Vulkan Tolbachik

Added over a year ago by Balduin

154

Indonezja w cieniu wulkanów - krajobraz jak z bajki
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Indonezja w cieniu wulkanów

Added over a year ago by Gosia

78