Eurasian and North American plate. Spreading motion. Constructive oceanic lithosphere created.
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Destructive/Convergent Margin
Nazca and South American plate. Subduction at boundary. Destructive oceanic lithosphere destroyed.
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Conservative/Transform Margin
North American and Pacific plate. Lateral sliding motion. Conservative, crust neither created nor destroyed.
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Features at Constructive Margins
Rift valleys (when under land), mid-ocean ridges (when under water), earthquakes and volcanoes.
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Features at Destructive Oceanic-Continental Margins
Deep sea trenches, young fold mountains, earthquakes and volcanoes.
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Features at Destructive Oceanic-Oceanic Margins
Deep sea trenches, island arcs, earthquakes and volcanoes.
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Features at Destructive Continental-Continental Margins
Fold mountains, earthquakes and volcanoes.
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Features at Conservative Margins
Low ridges and earthquakes.
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Rift Valleys
Plates diverge beneath land causing magma to rise which causes the continental crust to bulge, and fracture creating fault lines. As plates move apart the crust between parallel faults drops down.
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Mid Atlantic Ridge (mid-ocean ridge)
Diverging plates under water pull apart causing magma to rise to the surface creating new crust. Underwater volcanoes erupt along mid-ocean ridges and can build to be above sea level.
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Ocean Trenches (deep sea trenches)
Denser plate subducts, ocean floor pulled down to form a trench (Peru-Chile and Mariana).
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Fold Mountains
Sediments accumulating on the continental shelf forced upwards and deformed by folding.
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Island Arcs
Subduction processes in plate convergence also result in the formation of volcanoes which over millions of years, pile up lava on the ocean floor under a submarine volcano rises above the sea level to form an island arc.
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Strike Slip Fault
Fault rupture of the ground generates vibrations or waves in the rock that we feel as the ground shakes. Faults are weaknesses in the rock and therefore earthquakes then to occur over and over again in the same place.
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Other cards in this set
Card 2
Front
Nazca and South American plate. Subduction at boundary. Destructive oceanic lithosphere destroyed.
Back
Destructive/Convergent Margin
Card 3
Front
North American and Pacific plate. Lateral sliding motion. Conservative, crust neither created nor destroyed.
Back
Card 4
Front
Rift valleys (when under land), mid-ocean ridges (when under water), earthquakes and volcanoes.
Back
Card 5
Front
Deep sea trenches, young fold mountains, earthquakes and volcanoes.
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