Youtor
Tectonic Plate BoundariesMargins AQA GCSE 91 Geography
>> YOUR LINK HERE: ___ http://youtube.com/watch?v=-PQBgveU7q0
What are plate boundaries or plate margins? What happens at constructive plate margins? What happens at destructive plate margins? What happens at conservative plate margins? • This is the third video for the AQA GCSE 9-1 Geography course, and the third video of the Challenge of Natural Hazards topic. • The Challenge of Natural Hazards Playlist: • » • The Challenge of Natural Hazards | AQ... • Follow me on all platforms: • » https://linktr.ee/keducate • Do you have a video suggestion? • » https://forms.gle/gxc3xHQ1b1wUeANT9 • 00:00 What are plate boundaries? • 00:17 Constructive/divergent boundaries • 00:42 Destructive/convergent boundaries • 01:45 Conservative boundaries • 02:14 Outro • Video Script: • What are plate boundaries? • As covered previously, the Earth’s crust is broken up into pieces called tectonic plates. Where these plates meet is very important, and what this video is all about. A plate boundary, also known as a plate margin, is where two or more tectonic plates meet, and there are three different types. • Constructive plate margins • Constructive or divergent plate margins are where the plates are moving away from each other. Both earthquakes and volcanic eruptions can occur here. • Earthquakes can happen due to the movement of the plates over the mantle and when magma breaks through the crust as it forces its way to the surface. • Shield volcanoes are formed when the magma rises up and makes new land. • An example of a constructive plate margin is the Mid-Atlantic Ridge. • Destructive plate margins • Destructive or convergent plate margins are where plates are moving towards each other. This movement can cause earthquakes. • What happens at a destructive plate margin depends on the types of plates. • Subduction occurs if there is an oceanic plate and a continental plate. As the oceanic plate is more dense than the continental plate, when they collide the oceanic plate is forced under the continental plate. The place this occurs is known as the subduction zone. When the oceanic plate sinks into the mantle, it melts, forming magma. This magma rises up, at composite volcanoes, which have very violent eruptions. Examples of destructive plate boundaries are the Eurasian Pacific plate, and the Nazca South American plate. • If both plates are continental, something different occurs. Neither of the plates are subducted, and instead the crust becomes crumpled and uplifted, forming fold mountains. This mountain building process causes earthquakes. This margin is known as a collision margin, and an example is the Himalayas. • Conservative plate margin • And finally, conservative plate margins are where plates are moving alongside each other at different speeds. • As the plates move, friction causes earthquakes. The plates can become stuck, which causes a build up of pressure, and when the pressure is finally released, a massive amount of energy is released, causing an earthquake. These earthquakes can be very destructive, as they are shallow-focus, meaning they occur close to the Earth’s surface. • An example of a conservative plate margin is the San Andreas fault. • -- • GCSE Geography • 24/04/2020 • Keducate
#############################
