Destructive Plate Boundaries by C Brock https://padlet.com/1700386/992xq0pj5osx en-us 2018-05-16 18:32:09 UTC 2025-11-06 20:16:47 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Dootheets.png 1700386 https://padlet.com/1700386/992xq0pj5osx/wish/261346646 As the plates collide, the oceanic plate is forced beneath the continental plate. This is known as subduction and results in the formation of an ocean trench. This happens because the oceanic plate is denser (heavier) than the continental plate. The oceanic crust bends downwards and slides back into the mantle. Oceanic trenches are long, narrow, deep features in the seabed. Most as deeper than km. The Mariana Trench, in the Western Pacific Ocean, is 11km deep, 2,500km long and has an average width of 70km. ]]> 2018-05-16 18:32:46 UTC https://padlet.com/1700386/992xq0pj5osx/wish/261346646 Further Understanding - A Level 1700386 https://padlet.com/1700386/992xq0pj5osx/wish/261346846 If two continental plates collide, neither can sink and so the land buckles upwards to form fold mountains. This can also be referred to as a collision margin. As neither plates can be subducted, the continental crust is squeezed together and pushed upwards. The Himalayas are an example of a fold mountain range, created when the Indian plate collided with the Eurasion plate.

]]> 2018-05-16 18:33:16 UTC https://padlet.com/1700386/992xq0pj5osx/wish/261346846 1700386 https://padlet.com/1700386/992xq0pj5osx/wish/261346954 2018-05-16 18:33:35 UTC https://padlet.com/1700386/992xq0pj5osx/wish/261346954 1700386 https://padlet.com/1700386/992xq0pj5osx/wish/261347141 At a destructive plate boundary - also known as a convergent plate boundary - the plates are moving towards one another. It usually involves an oceanic plate and a continental plate. This movement can cause earthquakes and volcanoes. An example of this plate boundary or margin is where the Nazca and South American plates are converging.]]> 2018-05-16 18:34:07 UTC https://padlet.com/1700386/992xq0pj5osx/wish/261347141 1700386 https://padlet.com/1700386/992xq0pj5osx/wish/261347301 As the oceanic crust subducts under the continental crust, the friction can cause earthquakes. The oceanic crust is forced to sink under the continental crust as it is much denser. Friction locks the plates together, and as pressure increases, friction is finally overcome and the plates move with a violent jerk. These large earthquakes can have huge impacts. It was this type of subduction zone earthquake that caused the 2011 tsunami in Japan.]]> 2018-05-16 18:34:40 UTC https://padlet.com/1700386/992xq0pj5osx/wish/261347301 1700386 https://padlet.com/1700386/992xq0pj5osx/wish/261347754 Continental Crust - The surface of the Earth's crust found underneath large land masses.
Oceanic Crust - The surface of the Earth's crust found underneath the oceans, forming the ocean floor.

]]> 2018-05-16 18:35:49 UTC https://padlet.com/1700386/992xq0pj5osx/wish/261347754 1700386 https://padlet.com/1700386/992xq0pj5osx/wish/261348272 Subduction - When one crustal plate is forced beneath the other.
Slab pull - When the oceanic plate is being pulled away from the constructive plate boundary and being pulled down at a destructive plate boundary due to gravity. ]]> 2018-05-16 18:37:18 UTC https://padlet.com/1700386/992xq0pj5osx/wish/261348272 1700386 https://padlet.com/1700386/992xq0pj5osx/wish/261350296 2018-05-16 18:42:32 UTC https://padlet.com/1700386/992xq0pj5osx/wish/261350296 1700386 https://padlet.com/1700386/992xq0pj5osx/wish/261358235 2018-05-16 19:04:38 UTC https://padlet.com/1700386/992xq0pj5osx/wish/261358235 1700386 https://padlet.com/1700386/992xq0pj5osx/wish/261358484 2018-05-16 19:05:30 UTC https://padlet.com/1700386/992xq0pj5osx/wish/261358484 1700386 https://padlet.com/1700386/992xq0pj5osx/wish/261360453 2018-05-16 19:12:02 UTC https://padlet.com/1700386/992xq0pj5osx/wish/261360453 1700386 https://padlet.com/1700386/992xq0pj5osx/wish/261364752 When the plate sinks into the mantle it melts to form magma. The pressure of the magma builds up beneath the Earth's surface. The magma escapes through weaknesses or cracks in the rock and rises up through a composite volcano, also known as a stratovolcano. The volcanic eruptions are often violent, with lots of steam, gas and ash. These volcanoes can also form in the sea, when two oceanic plates collide. ]]> 2018-05-16 19:25:28 UTC https://padlet.com/1700386/992xq0pj5osx/wish/261364752 1700386 https://padlet.com/1700386/992xq0pj5osx/wish/261365981 2018-05-16 19:29:51 UTC https://padlet.com/1700386/992xq0pj5osx/wish/261365981 1700386 https://padlet.com/1700386/992xq0pj5osx/wish/261366131 2018-05-16 19:30:26 UTC https://padlet.com/1700386/992xq0pj5osx/wish/261366131 Colima Volcano, Mexico 1700386 https://padlet.com/1700386/992xq0pj5osx/wish/261367493 2018-05-16 19:35:03 UTC https://padlet.com/1700386/992xq0pj5osx/wish/261367493 1700386 https://padlet.com/1700386/992xq0pj5osx/wish/261368253 2018-05-16 19:37:49 UTC https://padlet.com/1700386/992xq0pj5osx/wish/261368253 1700386 https://padlet.com/1700386/992xq0pj5osx/wish/261368630 2018-05-16 19:39:09 UTC https://padlet.com/1700386/992xq0pj5osx/wish/261368630 1700386 https://padlet.com/1700386/992xq0pj5osx/wish/261475304 Fold mountains occur when two tectonic plates collide into one another. The Andes Mountains run the length of the West Coast of South America, rising in the North in Colombia and finishing in Chile and Argentina in the South.   They are world's longest mountain range running for over 7,000km and covering 6 countries. 
The mountains have been formed as a result of the convergence (moving together) of the Nazca plate and the South American plate.  The heavier oceanic crust of the Nazca plate is pushed towards the South American plate, and because it is denser is subducted underneath.  The South American plate is less dense so sits on top of this subduction zone, but the rocks of the South American plate have been folded upwards and crumpled into fold mountains. This has created a sequence of volcanoes and fold mountains, rising up to 6962m at Aconcagua.  The trench (marking the boundary between the Nazca and South American plates) to the West of the Andes mountains is called the Peru-Chile Trench, and reaches an incredible depth of 8066m under the sea level.
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