2.2 Physical processes at plate margins
2.2 Physical processes at plate margins
Embedded Files
What you need to know:
What you need to know:
The physical processes at constructive, destructive and conservative plate margins
Why this matters:
Why this matters:
The movements at tectonic plate margins shape our planet's surface and can lead to natural disasters. Understanding these processes is essential for predicting geological events and for the planning and construction of infrastructure in areas that could be affected by these events.
What physical processes occur at constructive plate margins?
What physical processes occur at constructive plate margins?
Constructive plate margins are where tectonic plates move apart. As they do, magma from the mantle rises to fill the gap, causing mild earthquakes and forming new crust as it cools, often resulting in the creation of mid-ocean ridges and volcanic islands.
What are the characteristics and consequences of destructive plate margins?
What are the characteristics and consequences of destructive plate margins?
At destructive plate margins, an oceanic plate typically subducts under a continental plate due to its higher density. This process causes strong earthquakes and can create volcanic eruptions as the subducted plate melts, forming composite volcanoes. When two continental plates collide, they can create mountain ranges, such as the Himalayas, accompanied by powerful earthquakes.
How do conservative (transform) plate margins operate?
How do conservative (transform) plate margins operate?
Conservative, or transform, margins are where two tectonic plates slide past each other horizontally. The friction between the plates does not allow for smooth movement, resulting in stress that is released as earthquakes. Since there is no magma production at these margins, volcanoes do not form.
Common misconceptions (these things are WRONG)
Common misconceptions (these things are WRONG)
Big earthquakes and volcanic eruptions only occur at destructive plate margins.
Volcanic activity is common at all types of plate margins.
Summary
Summary
Constructive margins: Tectonic plates move apart, magma rises, creating new crust and volcanic islands.
Destructive margins: Oceanic plates subduct beneath continental plates, causing strong earthquakes and volcanic eruptions; continental collisions form mountains.
Conservative margins: Plates slide past each other, causing stress and earthquakes, without volcanic activity.
Page updated
Google Sites
Report abuse