* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Physical processes taking place at different types of plate margin
Survey
Document related concepts
Volcano (1997 film) wikipedia , lookup
Mount Edziza volcanic complex wikipedia , lookup
Mount Vesuvius wikipedia , lookup
Nevado del Ruiz wikipedia , lookup
Shield volcano wikipedia , lookup
Mount Pelée wikipedia , lookup
Cascade Volcanoes wikipedia , lookup
Cerro Azul (Chile volcano) wikipedia , lookup
Wells Gray-Clearwater volcanic field wikipedia , lookup
Transcript
What are the arrows showing? Key idea: Earthquakes and volcanic eruptions are the result of physical processes • Plate Tectonics theory • Global distribution of earthquakes and volcanic eruptions and their relationship to plate margins. • Physical processes taking place at different types of plate margin (constructive, destructive and conservative) that lead to earthquake and volcanic activity. Physical processes taking place at different types of plate margin (constructive, destructive and conservative) that lead to earthquake and volcanic activity. Up to 4: Name the plate margins and offer a basic description of some activity at plate margins . 5/6: Describe and begin to explain the physical processes taking place at all 3 plate margins with accuracy and increasing detail. 7+: Describe and explain the physical processes taking place at all 3 plate margins with accuracy and detail. Physical processes taking place at different types of plate margin (constructive, destructive and conservative) that lead to earthquake and volcanic activity There are 3 main types of plate margin The Destroyer Destructive margins are where two plates are _______________ each other e.g. along the west coast of south America. Where an oceanic plate meets a continental plate, the denser __________ plate is _________________ into the mantle and ___________________. This often creates _______________ and ________________ (very deep sections of the ocean floor where the oceanic plate goes down). Where two continental plates meet, the plates collide and the ground is ___________ and _____________ to create mountain ranges. volcanoes moving towards folded oceanic ocean trenches destroyed forced down forced upwards The Builder Constructive margins are where two plates are ______________ from each other, e.g. at the mid-Atlantic ridge. ___________ (molten rock) ____________ from the mantle to fill the gap and cools to ___________________________. Magma create new crust rises moving away The Conserver Conservative margins are where two plates are moving ____________ past each other, or are moving in the same direction but at different _________ e.g. along the west coast of the USA. Crust isn’t __________ or __________. created destroyed sideways speeds What do these 4 have in common? When a volcano erupts it emits lava and gases. Some volcanoes emit lots of ash which can cover land, block out the sun and form pyroclastic flows (super heated gas, ash and rock). Y Z X Two oceanic plates move away from each other. X Magma rises up into the gap created by the plates. This allows a volcano to form. Z Repeated eruptions build the volcano up. Y E C B D F A Dense oceanic plate goes under the continental plate. B Oceanic plate moves into the mantle, melts and is destroyed. F This forms magma in a magma chamber. A Magma rises through cracks in the continental crust. These cracks are called vents. D The magma erupts to the surface as lava, forming a volcano. E Repeated eruptions build the volcano up. C Earthquake An earthquake is a tremor felt in the ground. Plates can get stuck against each other. When they become unstuck they cause earthquakes. Tension builds up when plates grinding past each other get stuck. Tension builds up when one plate gets stuck as is subducts down into the mantle Tension builds along cracks within the plates as they move away from each other Literacy In Geography All the words below are important for explaining how earthquakes happen at plate boundaries. You should try to include as many as you can in an exam answer. stuck snap energy friction pressure release move shockwaves plates The Richter Scale or Earthquake Magnitude Scale Measures the magnitude (strength) of an earthquake by the energy released using the seismometer. Many people think that 10 is the highest, but this scale is actually openended. The highest recorded earthquakes have not yet exceeded 10. The seismogram This is a print-out of a seismogram after an earthquake has happened. Seismogram Scenarios Where would each event be most likely to happen on the seismogram? A brick bounces off Dave's head Paul takes cover underneath a table Jim pours himself a nice cold beer before sitting down to watch the match Leanne and Taylor jump out of their seats Kelly dials 999 When you've done them, make up 3 of your own. Is there a relationship between magnitude & number of earthquakes? Physical processes taking place at different types of plate margin (constructive, destructive and conservative) that lead to earthquake and volcanic activity Match the type of plate boundary to the correct description (3) Oceanic crust is forced down. Volcanoes and ocean trenches are created. Plates move past each other. Nothing is created or destroyed. Plates move away from each other. Magma fills gap. Volcanoes are created. Conservative Destructive Constructive Point Marked With the aid of an annotated diagram, outline the characteristics of a destructive margin (4) L1 1-2 marks: Random events L2 3-4 marks: Idea of a sequence of events Level Marked Compare the characteristics and features of a conservative margin with those of a constructive margin.(6) L1 1-2 marks: Characteristics or features described L2 3-4 marks: Characteristics and features described L3 5-6 marks: Characteristics and features compared Level Marked Plenary 3 types of plate margins 2 plate margins where volcanoes are formed 1 plate margin where only earthquakes happen Key idea: Earthquakes and volcanic eruptions are the result of physical processes • Plate Tectonics theory • Global distribution of earthquakes and volcanic eruptions and their relationship to plate margins. • Physical processes taking place at different types of plate margin (constructive, destructive and conservative) that lead to earthquake and volcanic activity.