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Plate tectonics 5th year
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Describe 'Strata'
The visible bands of colour in a rock - caused by layers of different sediment
An example of the Alpine fold mountain era
The Himalayas, The Alps
When was the Armorican folding era? and an Irish example
270 MYA - Munster Ridge and Valley
An example of a Caledonian era mountain range
the 12 pins Connemara, Galway, Dublin/ Wicklow mountains
Which fold mountain building era is the oldest and how old?
Caledonian 450 MYA
Give a named example of a convergent plate boundary
The Himilayas - Indian and Eurasian plate
Give a named example of a divergent boundary
Mid Atlantic Ridge - Eurasian and North American plates
Give a named example of a Transform boundary + what plates involved
San andreas fauly - Pacific and N. American plate
Desribe a transform boundary
2 plates slide past eachother. San Andreas fault is an example. Earthquakes occur. No new land created or destroyed as neither plate subducts or seperates
Describe what happens at a Convergent boundary
2 plates collide. One plate eventually subducts. There are 3 examples of boundaries- ocean-ocean, cont-cont or ocean-cont
Describe what happens at a Divergent plate boundary
Plates seperate, magma rises to earth and creates new crust. Earthquakes are common here. Mid Atlantic ridge is an example
Give 3 reasons supporting Wegeners theory of Continental drift
Fossils match, jigsaw, coral, mountains, rocks
What 2 theories make up the theory of plate tectonics?
Sea floor spreading and Continental drift
Which plate is more dense Oceanic or continental?
Oceanic crust is denser but shorter in lenght KMs deep
What theory did Alfred Wegner propose and what did it entail?
Continental drift...
Who discovered Sea floor spreading?
Harry Hess


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