What is a dormant volcano? (Intrusive tectonics)
If it has not erupted for years but sometimes seeps gas
What is an extinct volcano? (Intrusive tectonics)
If it has not erupted for thousands of years and has been weathered
What is an intrusive feature? (Intrusive tectonics)
Magma cools and solidifies into igneous rock below the earths surface
What kind of crystals does slow cooking produce? (Intrusive tectonics)
Larger crystals e.g granite
What is a Dyke? (Intrusive tectonics)
- Solidified magma often forms into groups called swarms
- highly resistant
- thin, tall
What is an example of a dyke? (Intrusive tectonics)
Isle of mull
What is a Sill? (Intrusive tectonics)
- magma solidifies in strata (layers)
* when exposed to erosion they form steep sided cliffs
What is an example of a sill? (Intrusive tectonics)
Great whin sill
What is a Laccolith? (Intrusive tectonics)
- formed when viscous magma forces the underlying rock to strata
- looks like a dome
What is an example of a Laccolith? (Intrusive tectonics)
Eildon Hills
What is a Batholith? (Intrusive tectonics)
- Most other features feed off this before it solidifies
* exposed to extreme heat which alters adjacent rock
What is an example of a batholith? (Intrusive tectonics)
Dartmoor
What is an active volcano?(intrusive tectonics)
If it has erupted recently and is likely to do so again
