Understanding plate tectonic processes

 New ELI today - 'What do the top and bottom of a tectonic plate look like? Questions to test understanding of plate tectonic processes'.

When asked to draw tectonic plates on cross sectional diagrams, many students have drawn plates deep beneath the surface, thus showing a lack of understanding of plate processes.
This deep question discussion tests understanding not only of the tops of plates but also of the lithosphere-asthenosphere boundary (LAB) at the bases of plates, currently the focus of much geoscientific research across the world.
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