Plate Movement

Plate Movement

This page provides an in-depth look at plate movement and all its known causes. It's best to start without sharing the objectives because following the map activity, the gallery activity introduces the key ideas through images that students need to connect. Following this students work their way through a number of well chosen videos, animations, images and text based resources to complete a number of visually impressive worksheets, on Earth's structure, causes of plate movement, rifting and mantle plumes.

Enquiry Question

What causes tectonic plates to move?

Lesson Time: 1 Hour

Lesson Objectives:

  • To explain the mechanisms of plate movement to include internal heating, convection currents, plumes, subduction and rifting at plate margins

Teacher Notes:

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tarter - Plate Movement Map - This simple stater map familiarizes students with the plates and plate boundaries and gets them thinking of plate movement by adding the missing arrows. In addition what are most plate boundaries jagged an uneven?

Plate Movement Processes - Students should study the gallery of images and then decide what connects them. Quick activity. Repeat the gallery and then students should identify the process it shows. (answers in the drop down box)

A History of Plate Movement - This video can be used to reinforce the learning above

Earth's Structure Worksheet - Students can then add the labels to the Earth structure diagram

Heat Sources and Convection Cells - Watch the next two videos and students should make notes on the sheet provided.

Plenary on Plate Movement - Drag and drop the sentences into the sequence to explain plate movement. These activities don't always have an exact answer but are useful to get the students actively reading the text.

Rifting Animation - Students should then watch the rifting animation and complete notes to explain the sequence of processes based on the screenshot images

Mantle Plumes and Hotspots - You can introduce students to hotspots through the gallery, students can simply make notes on the chalk and talk.

Exam Question Hotspots - A common question is hotspots - in this question only 4 marks are available and it requires use of the diagram. Good to practice these often

Student Assessment - There is a clear brief for this 6 mark question to explain plate movement

Starter Activity - Plate Movement Map - Processes and Spatial Interactions

  1. Study the map of plate boundaries on the PDF and complete the map with the missing arrows to show plate movement
  2. Referring to the map discuss why the plates boundaries appear to be so jagged an uneven

Plate Movement Map

Student Activity - What connects the images? Processes

Study the gallery and decide what connects all the images?

  1. Image 1 - Convection cells
  2. Image 2 - Radio active decay
  3. Image 3 - Meteorite collisions forming Planet Earth
  4. Image 4 - Slab Pull at subduction zones
  5. Image 5 - Ridge Push  at divergence zones
  6. Connecting factors - reasons why plates move

Student Activity - A History of Plate Movement - Processes and Spatial Interactions

Watch the following video showing the history of plate movement and continentality (watch to 3.40mins)

Student Activity - The Mechanisms of Plate Movement? Processes

  1. Study the diagram of the Earth's structure and add the numbered box to correct place on the diagram

Earth's Structure

Student Activity - Heat Sources and Convection Cells - Processes

Watch the two videos and make the transcipt notes on the worksheet

Follow up the videos with the following sorting activity

 

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Once cooled sufficiently, rising magma will cease to rise but is forced sideways by rising magma below  

As magma rises and cools it vertical movement slows down  

Eventually cooled magma is forced to fall.  

If rising magma is in contact with the crust it forces plate movement. In other areas this creates fresh oceanic crust and a process called ocean floor spreading.  

Elements that are warmer than elements above it are forced to rise.  

Rising elements within the mantle create mantle plumes  

The core is immensely hot due to primordial heat.  

Unstable elements within the core decay over time and heat is produced from radioactive decay.  

 

 

Total Score:

Heat Sources and Convection Cells

Student Activity - Ridge Push and Slab Pull Processes - Processes

Study the following diagram and suggest how it helps explain plate movement

Read the text below and annotate the diagram to explain the process of Ridge Push and Slab Pull

Ridge Push and Slab Pull

Ridge Push

The lithosphere thickens with distance (and time) away from the mid-ocean ridge.  This is because it cools as it moves away from the ridge and the boundary between the solid lithosphere and the plastic asthenosphere becomes deeper. The result of this thickening with distance from the ridge is that the lithosphere/asthenosphere boundary slopes away from the ridge.  The weight of the lithosphere on this sloping surface produces a downslope force.  And since the asthenosphere is weak, the weight of the lithosphere near the ridge sliding down the asthenosphere "pushes" the older part of the plate in front of it

Slab Pull

As lithospheric plates move away from mid-ocean ridges they cool and become denser.  They eventually become more dense than the underlying hot mantle.  At a subduction zone the denser of the two plated sinks under the less dense plate. During subduction, cool, dense lithosphere sinks into the mantle under its own weight, because it is denser than the mantle around it the process of subduction will continue. Therefore the weight of the subducting plate and the force of gravity drives its movement. Slab pull is considered the most important factor causing plate movement.

Student Activity - Rifting - Processes

Study the animation and complete the text boxes to explain the process of rifting at divergent plate boundaries

wwnorton animation

Student Activity - Plumes - Processes

Study the following gallery showing mantle plume and hotspots and annotate the diagrams in the worksheet to describe the characteristics of hotspots and to describe how they show plate movement.

Plumes and Hotspots

Exam Question - Hotspots - Processes

With the use the diagram (2) explain the evidence to explain the presence of hotspot volcanoes (4 marks)

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