Plate Tectonics (Junior Cert Geography): Flashcards
📚Flashcards
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Practise the cards
15 cards from this deck
Plates
Plates
Large, rigid pieces of Earth's crust
Cause of plate movement
Cause of plate movement
Convection currents in the mantle
Convection currents
Convection currents
Circular movements of hot magma in mantle that move plates
Plate boundaries
Plate boundaries
Edges where two tectonic plates meet
Constructive boundary
Constructive boundary
Two plates moving away from each other
Example: Constructive boundary
Example: Constructive boundary
Mid-Atlantic Ridge (runs through Iceland)
Fissure
Fissure
Gap created when plates separate
Destructive boundary
Destructive boundary
Two plates collide, one sinks below other
Example: Destructive boundary
Example: Destructive boundary
Andes Mountains in South America
Passive boundary
Passive boundary
Two plates slide past each other horizontally
Pangaea
Pangaea
Supercontinent where all continents were once joined
Continental drift proposer & year
Continental drift proposer & year
Alfred Wegener, 1912
When Pangaea existed
When Pangaea existed
200 million years ago
Evidence for continental drift
Evidence for continental drift
Fossils, rock formations, continents fit like puzzle
Rate of plate movement
Rate of plate movement
Few centimetres each year