Plate Tectonics and Associated Hazards Volcanic Eruptions and intrusive volcanoic landforms

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Plate Tectonics and Associated Hazards
Volcanic Eruptions
There are variations in form, frequency and type of volcanic eruption which are related to
the different kinds of plate margin, emissions and lava.
Different plate margins cause different types of lava which lead to different types and
frequencies of eruptions and there different margin effect volcanic eruptions and landforms
created.
Constructive plate margins Destructive plate margins
Plate Margin
Type of magma Basaltic
Acidic
Lava Low
characteristics High
Silica
Type of Little violence: gases easily escape Potentially explosive: lava shatters into
eruption pieces
Materials Mainly lava Lava bombs, ash, dust
erupted
Frequency of Regular and can be continuous From time to time: long dormant
eruption time periods
Form of the
volcano

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Intrusive Volcanic Landforms
When magma is force upwards, only a small amount reaches the surface. Ther rest of the
magma is intruded into the crust where it solidifies into a range of features which are often
exposed later by erosion.
Batholiths:
Form deep below the surface where large masses pf magma cool and solidify forming large
crystals of e.g. granite in the rock.…read more

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