the differences between continental and oceanic crust
Continental-25km-100km think,lighter,never sinks or is destroyed. Oceanic-denser because of ocean above,5km thick,constantly being renewed and destroyed.
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Another name for convergent plate boundary?
destructive plate boundary
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Another name for a divergent plate boundary?
constructive plate boundary
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Another for conservative plate boundary?
transform plate boundary
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Explain what happens at a convergent/destructive plate boundary and features that are made.
Where condimental crust meets continental crust and a slow collision takes place,leads to folding faulting and uplift,and creates mountains. Few earthquakes and no volcanoes.
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Explain what happens at a divergent/conservative plate boundary and features that are made.
Two plates move away from each other commonly in the middle of oceans because of convection currents. As the plates move apart,pressure causes the crystal rocks to fiacture and a gap and a mid ocean ridge is formed. Magma rises to fill the gap,volcan
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Explain what happens at a conservative/transform plate boundary and features that are made.
Where 2 plates move parallel to the plate margin due to convection currents,pressure builds and the plates spring apart cause seismic waves and violent earthquakes. Plates stick as move past each other
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What is a hot spot?
a fixed point in the earths crust where very hot magma rises from the mantle to the crust which can form a chain of islands.
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What is a earthquake?
a sudden movement in the earths crust
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what is the focus?
A key feature of an earthquake. The point underground where the earthquake starts
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What is the epicentre?
A key feature of an earthquake. The point on the earths surface directly above the focus of the earthquake
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What is a Richter scale?
a scale used to measure the magnitude of earthquakes
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What is a Mercalli scale?
a measurement of the intensity of an earthquake based on the damage caused
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why do people still live near volcanoes?
Volcanoes provide popular tourist areas,Minerals are found from volcanic rocks and people don't believe that the volcano will erupt.
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Why do people still live in earthquake zones?
Believe chance of them being affected by earthquake is low,the earthquake proof buildings available now make the people feel safer, some houses are so nice they buy them even though they are by an earthquake zone
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Causes and effects of an earthquake on people and the environment
Destroy many settlements,loss of lives,have impact on wealth of the area
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Causes and effects of a volcanic eruption on people and the environment
houses,roads and buildings covered in ash,landscapes can be destroyed,many lives lost
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How can we try and predict if there is going to be an earthquake or volcanic eruption?
Gas samples,temperature,seismometers,imaging techniques,volcano gives warning signs
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How can we try to prevent and reduce the effects of an earthquake or volcanic eruption?
Planning and education-schools teaching duck cover and hold on. Building design and defence-earthquake proof buildings.
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Other cards in this set
Card 2
Front
Another name for convergent plate boundary?
Back
destructive plate boundary
Card 3
Front
Another name for a divergent plate boundary?
Back
Card 4
Front
Another for conservative plate boundary?
Back
Card 5
Front
Explain what happens at a convergent/destructive plate boundary and features that are made.
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