ICSE BoardEnglish MediumSTD 9GeographyVolcanoes2 Marks
Question
Mention any two extrusive landforms caused by volcanic eruptions.
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Answer
Composite cone: The volcano which erupts both lava and pyroclastic rocks form alternating layers of these two materials and build up to form composite cones. Examples: Fujiyama in Japan Vesuvius and Stromboli in Italy.
Caldera: During repeated eruptions, the summit of a volcano may be blown up. In its place, a large depression called caldera is formed. These are generally formed when the magma chamber is no longer able to emit sufficient magma and results in the collapse of a cone either partly or wholly.
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