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Describe how each of the following volcanic features are formed:
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asked
Jun 22, 2021
in
Geography Form 2
by
anonymous
Describe how each of the following volcanic features are formed:
Caldera.
internal land forming processes
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Jun 22, 2021
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anonymous
lava pours out of a central vent to form volcanic cone
Vent is sealed when lava solidifies
Solidifies lava blocks gases and steam beneath, preventing them from escaping
Pressure piles up below, leading to a violent eruption which blows off the top of the cone forming depression.
The depression is large and circular and it is known as caldera
OR
Lava pours out of central vent to form volcanic cone
Magma chambers are left empty/void
Due to overlying weight at top of cone, pressure is exerted
Top of the cone subsides forming a depression
This depression is large and circular and is called a caldera
OR
(outward collapsing theory)
A volcano is build of ash and pyroclasts to form a dome
Weak materials at the base are unable to support the overlying materials / weight
Materials at thee base spread outward as top part subsides, leading to large depression known as caldera.
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