Forms of Intrusive Activity (Plate Tectonics and Hazards)
Refers to AQA A2 Geography - Plate Tectonics and assosiated hazards.
A mind map relating to the formation of intrusive activity (volcanoes).
This came up as an 8 mark question recently so might be worth a look.
- Created by: Bethany
- Created on: 23-12-13 17:50
View mindmap
- Forms of Intrusive Volcanic Activity
- Dykes
- Dykes are steep, sheet like intrusions.
- They occupy vertical weaknesses in the rock, often cutting across rock bedding and forming low ridges.
- Visible on Isle of Arran, Scotland.
- They vary from a few mm across to tens of metres.
- Sills
- Sills are layers of igneous rock that follow the bedding of sedimentary rock layers.
- e.g. the Great Whin Sill, Northern Ireland.
- Visible on Isle of Arran, Scotland.
- Batholiths
- Like oil in water, deep-seated masses of magma may rise as huge blobs. They solidify within a few km of the surface to form plutons.
- They may be added to over millions of years to form batholiths.
- Some may reach over 1000km in length.
- e.g. giant batholith underlying the South West of England from Dartmoor to Lands End.
- Some may reach over 1000km in length.
- They may be added to over millions of years to form batholiths.
- e.g. giant batholith underlying the South West of England from Dartmoor to Lands End.
- Like oil in water, deep-seated masses of magma may rise as huge blobs. They solidify within a few km of the surface to form plutons.
- Formation
- Sometimes, rising magma never reaches the surface as it is intruded into weaknesses in the rocks and then cools down later.
- When softer rock above the intrusion was eroded away, they often become prominent features of the landscape.
- Sometimes, rising magma never reaches the surface as it is intruded into weaknesses in the rocks and then cools down later.
- Dykes
- They vary from a few mm across to tens of metres.
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