Flashcards
Plate Boundries
Cards in this deck (10)
- 1What does this diagram represent?Conservative plate Margin
- 2What happens in a conservative plate margin?Constructive plate margins occur where plates slide past each other in opposite directions, or in the same direction but at different speeds
+Friction is eventually overcome and the plates slip past in a sudden movement
+the shock waves created produce earthquakes - 3What does this diagram represent?Destructive plate Margin
- 4What is a destructive plate margin?It occurs when oceanic and continental plates push into each other. The Oceanic plate is forces under the lighter continental plate. Friction causes melting of the oceanic plate and may trigger earthquakes
- 5Describe the steps of Destructive Plate Margin1. The oceanic plate is heavier. So it gets pulled down by gravity at an ocean trench
2. The rock grinds its way downwards causing earthquakes
3. Some rock melts an forces its way up through the cracks to form a volcanoe - 6What is a constructive plate margin?It occurs when plates move apart. Volcanoes are formed as magma swells up to fill up the gap
- 7Describe the events of a constructive plate margin1. the heavy plates are being pulled apart with the help of convection currents in the soft rock below them
2. liquid rock/magma rises to fill the gap, through underwater volcanoes. It hardens to basalt
3.AS THE PLATES MOVE, APART THE FLOOR OF THE Atlantic ocean widens- by about 2cm a year - 8Name the different layers of the Earth outer to centreCrust, Mantle, outer core, core
- 9What are convection currents?Convection currents occur in the mantle
+Heat from the core causes convection currents in the mantle
+They slowly move the crust around
+In some places the crust is destroyed. In other places new crust is formed - 10Name the different platesEuraian Plate, North American Plate, African Plate, South American plate, Nazca Plate, Pacific Plate
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- Geography Flashcards on Plate Boundries, created by Mariel Ngemoh on 29/04/2017.
- Created by
- Mariel Ngemoh · Apr 2017
- Updated
- Jun 19, 2017
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