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A plate margin is the boundary / location where two slabs of Earth’s crust meet. This may be the meeting of crust of the same type or different types – such as oceanic and continental.
There are three main types of plate margins. These are constructive, destructive and conservative plate margins. Processes that occur at these boundaries lead to the formation of earthquakes and volcanoes.
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True or false? The majority of the Earth’s volcanoes and earthquakes occur at plate margins.
What are the three main plate boundaries?
True or false? The majority of the world’s earthquakes and volcanoes occur around the Atlantic Ocean.
At a constructive plate margin, the tectonic plates move away from each other. This is caused by convection currents in the mantle and slab pull/ridge push. Where two plates move apart, magma rises from the mantle to construct new land either through a volcano or a fissure (large crack through which magma rises). If this occurs in the middle of an ocean T a mid-oceanic ridge is formed. Rift valleys are formed where two plates move apart on land.
The movement of the plates over the mantle can cause earthquakes.
Iceland was formed due to the North American plate and Eurasian Plate separating at a constructive plate margin.
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What happens at a constructive plate margin?
Which of the following occur at a constructive plate margin?
Put the following sentences in order to describe what happens at a constructive plate margin.
Destructive plate margins typically form when an oceanic plate moves towards a continental plate. The oceanic plate usually subducts (sinks under) the continental plate. Earthquakes can occur when friction between the two plates is released.
The oceanic plate subducts the continental plate because it is thinner and denser (heavier). An oceanic trench is formed where the oceanic plate subducts the continental plate.
When the oceanic plate sinks into the mantle, it melts to form magma. Pressure then builds below the surface of the Earth and magma rises through weaknesses in the crust and rises to the surface through a composite volcano. Eruptions from composite volcanoes tend to be violent, with large volumes of steam, ash and gas.
If two continental plates move towards each other, neither sinks, so the land folds and rises upwards, forming fold mountains. This type of margin is known as a collision margin. Earthquakes can occur at collision margins; however, they are free from volcanoes.
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What happens at a destructive plate margin?
Which of the following occur at a destructive plate margin?
Put the following sentences in order to describe what happens at a destructive plate margin.
At a conservative plate margin, two plates move past each other, either in opposite directions or the same direction but at different speeds.
As the plates move, friction occurs, and the plates get stuck. Over time pressure builds up until it is released, sending out vast amounts of energy, causing an earthquake.
Earthquakes along conservative plate margins can be very destructive as they often occur close to the surface of the Earth.
Volcanoes do not occur at conservative plate margins.
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What happens at a conservative plate margin?
Which of the following occur at a conservative plate margin?
Put the following sentences in order to describe what happens at a conservative plate margin.
A plate margin is the boundary / location where two slabs of Earth’s crust meet. This may be the meeting of crust of the same type or different types – such as oceanic and continental.
A constructive plate margin occurs where two plates move apart, whereas plates move together at a destructive plate margin. New crust is created at a constructive plate margin where it can be melted and destroyed at a destructive plate margin. Contrasting landforms occur at the different margins with fold mountains being found at destructive margins together with ocean trenches and composite volcanoes instead of mid-ocean ridges and shield volcanoes and rift valleys at constructive margins. Eruptions are more violent and earthquakes more severe at destructive plate margins.
X = Constructive
Y = Conservative
Z = Destructive
Two tectonic plates move apart due to convection currents in the Earth’s crust that determine the direction of movement. As they pull apart, a ‘gap’ is created between the plates. This is filled by magma rising up out of the mantle to plug the gap and make the crust complete.
As this occurs again and again, layers of lava solidify and build up to create volcanoes. This often happens under the oceans.
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Fill in the gaps below.
and volcanic eruptions affect people all over the world. They are caused by the movement of plates.
There are types of plate margin: constructive, conservative and plate margins.
A destructive plate margin usually involves an plate and a continental plate. The plates move towards one another and this movement can cause earthquakes.
The oceanic plate the plate. Earthquakes occur when between the two plates is released.
The oceanic crust the crust because it is thinner and more .
When the oceanic crust subducts into the , it melts to form . Magma rises through weaknesses in the , rises to the surface and forms volcanoes.
At plate margins two plates move apart. rises from the mantle to form new land. Both and mild earthquakes occur along constructive plate margins.
At plate margins two plates slide past each other. The plates do not pass smoothly, they get stuck because of . When this is overcome vast amounts of energy can be released causing to occur.