Plate Tectonics (AQA A-Level Geography): Flashcards
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Practise the cards
10 cards from this deck
Temperature of Earth's core
Temperature of Earth's core
Over 5,000°C
Asthenosphere
Asthenosphere
Semi-molten mantle layer, 100-700 km depth, allows plate movement
Continental vs oceanic crust density
Continental vs oceanic crust density
2.6 vs 3.0
Continental vs oceanic crust thickness
Continental vs oceanic crust thickness
30-70 km vs 6-10 km
Wegener's supercontinent 300 million years ago
Wegener's supercontinent 300 million years ago
Pangaea
Mesosaurus fossils in S. America & Africa show
Mesosaurus fossils in S. America & Africa show
Continents were once connected
Tectonic plate movement speed
Tectonic plate movement speed
5-10 centimetres per year
Constructive plate margin
Constructive plate margin
New crust forms as plates pull apart (mid-oceanic ridges)
Destructive plate margin
Destructive plate margin
Crust destroyed as plates converge (island arcs/mountains)
Conservative plate margin
Conservative plate margin
Plates slide past each other, no crust added or destroyed