Active learning ideas
Plate tectonics is the unifying theory of geology, explaining the movement of Earth's lithosphere and the resulting features of our planet. This topic covers the history of the theory, from continental drift to the discovery of seafloor spreading, and the mechanics of convection currents in the mantle. Students investigate the three main types of boundaries: divergent, convergent, and transform, as outlined in ACSES024 and ACSES025.
Activity 01
Using paper strips fed through a slit in a desk, students model the creation of new crust at a mid-ocean ridge. They use markers to create 'magnetic stripes' and observe how the oldest crust moves furthest from the ridge.
What evidence supports the theory of plate tectonics?
Activity 02
Students are assigned to argue for either 'Mantle Convection,' 'Slab Pull,' or 'Ridge Push' as the primary driver of plate movement. They must present evidence from recent geophysical studies to support their specific mechanism.
How do convection currents drive plate movement?
Activity 03
Groups create 3D models or detailed diagrams of specific boundaries (e.g., the Himalayas, the San Andreas Fault, the East African Rift). Students rotate and must identify the stress type (tension, compression, shear) at each station.
What geological features form at different plate boundaries?
A few notes on teaching this unit
Watch Out for These Misconceptions
Continents float on a sea of liquid magma.
The mantle is solid; plates move because the asthenosphere is ductile and can flow over long periods. Using a 'glacier' analogy helps students understand how solids can move without being liquid.
Gaps open up between plates during movement.
Earth is a closed surface; as plates move apart at one boundary, they must move together or slide past each other elsewhere. A 'sliding puzzle' activity can help students visualize how movement in one area necessitates movement in another.
Methods used in this brief
Earthquakes and Volcanic Activity
Investigate the causes and impacts of earthquakes and volcanic eruptions. Students will relate these phenomena to specific tectonic settings.
8 methodologies
The Rock Cycle and Mineral Formation
Explore the processes of the rock cycle and how igneous, sedimentary, and metamorphic rocks are formed. Students will identify common rock-forming minerals.
8 methodologies