Active learning ideas
This topic explores the hidden architecture of our planet, moving from the thin crust down to the solid inner core. Students examine the physical properties and chemical compositions of each layer, distinguishing between the mechanical definitions (lithosphere and asthenosphere) and the compositional layers. This foundational knowledge is essential for understanding the broader Eduqas AS/A-level specification, as it provides the physical context for plate tectonics and geomagnetic phenomena.
Activity 01
Small groups receive data cards describing different meteorite types (iron, stony-iron, chondrite). They must use this data to argue which meteorite type represents the core, mantle, or crust, presenting their findings to the class.
What evidence reveals the composition of the Earth's core?
Activity 02
Using a large circle on the floor to represent Earth, students act as P and S waves. They move in paths that demonstrate refraction and absorption, helping the class visually identify where the 'shadow zones' occur and why.
How do the lithosphere and asthenosphere differ?
Activity 03
Students first define the two layers individually based on mechanical properties. They then pair up to discuss why a rigid plate can move over a plastic layer, before sharing a refined analogy with the whole group.
Why does the Earth have a magnetic field?
A few notes on teaching this unit
Watch Out for These Misconceptions
The mantle is a liquid 'sea' of magma.
The mantle is almost entirely solid but behaves plastically over geological time. Peer discussion about S-wave propagation helps correct this, as S-waves cannot travel through liquids but do travel through the mantle.
The crust and the lithosphere are the same thing.
The lithosphere includes both the crust and the uppermost rigid mantle. Using a physical layering model helps students see that the mechanical boundary is deeper than the compositional boundary.
Methods used in this brief
Plate Tectonic Theory
Investigate the mechanisms driving plate tectonics, including mantle convection, ridge push, and slab pull. Examine the geological features associated with divergent, convergent, and conservative plate boundaries.
8 methodologies
Earthquakes and Seismic Waves
Explore the generation and propagation of P, S, and surface waves during seismic events. Students will learn how seismograms are used to locate epicentres and determine earthquake magnitude.
8 methodologies