Zusammenfassung der Ressource
Tectonics 2
- Constructive margins
- lithosphere spreads apart
- magma escapes + makes new crust material
- e.g Mid Atlantic Ridge
- Iceland; Surtsey, Heimey formed along it
- 1,000km wide with central rift valley
- shallow focus earthquakes and volcanic activity
- Destructive margins
- oceanic continental
- e.g The Andes
- denser oceanic is subducted beneath lighter continental
- creates ocean trenches, batholiths, volcanic mountain chains
- shallow-intermediate focus earthquakes
- e.g Chile 2010
- Subduction of Nazca under South American
- oceanic oceanic
- two oceanic plates converge
- makes volcanic island arcs + ocean trenches + earthquakes
- e.g Ryukyu Islands
- The Phillipines plate and the Eurasian
- Volcanic activity led to formation
- subduction leads to melting (Benioff Zone)
- continental continental
- continental crust doesn't subduct
- creates fold mountains (oregeny)
- not much earthquake and no volcanic activity
- intense folding, faulting + uplifting
- e.g Himalayas
- Indo-Australian Plate and Eurasian
- Mount Everest
- Conservative margins
- Plates slide laterally against eachother
- friction creates shallow focus earthquakes, no volcanic activity
- e.g San Andreas Fault
- Pacific Plate (faster) than North American