![](https://nthumb.tpgimages.com/mid2_ocom_img/c2NpZW5jZV9waG90bw==/4/2008041620/top_20080416201930_1291.jpg/TOP03207486.jpg)
Stratovolcano erupting, cutaway artwork. During a volcanic eruption, melted rock (magma, red/orange) moves up from a chamber through a conduit (pipe) and is forced out the top of the volcano as lava. Shattered rock (volcanic ash, grey) is also ejected. The enlarged section depicts crystals forming in cooling magma. The magma is cooling due a change in pressure as it migrates. When magma cools, minerals contained in it begin to crystallise, forming phenocrysts. The number of crystals in the magma determines it viscosity. Volcanoes with more viscous magma tend to erupt less frequently than those with less viscous magma, but with greater energy.
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Details
Creative#:
TOP03207486
Source:
達志影像
Authorization Type:
RM
Release Information:
須由TPG 完整授權
Model Release:
N/A
Property Release:
N/A
Right to Privacy:
No
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