This mini-lesson covers A2 1 Option A - Plate Tectonics: Theory and Outcomes: the evidence and theory of plate tectonics, processes and landforms at the four plate margins, volcanic activity and its management, and seismic activity (waves, prediction, preparation and response).
This is one of four A2 1 options; you study two. Answer each question to unlock the next screen. Press Start.
Evidence for plate tectonics includes the jigsaw fit of continents, matching fossils and rock sequences, palaeomagnetic striping of the ocean floor, and sea-floor spreading. Plates move over the asthenosphere, driven by convection, ridge push and slab pull.
Four margin types:
Volcanic activity occurs at constructive and destructive margins and at intra-plate hot spots. Its outcomes are both hazards (lava, pyroclastic flows, lahars, ash, gases) and benefits (fertile soils, geothermal energy, tourism, minerals).
CCEA requires a small-scale case study of volcanic activity (for example Pinatubo in 1991 or Montserrat from 1995) to evaluate how a country prepares for and responds to an eruption - monitoring, hazard mapping, evacuation and land-use planning.
Keep it honest: evaluate preparation and response qualitatively; do not invent casualty or cost figures.
Tap a feature, then tap the margin type.
Earthquakes release energy as seismic waves: P (primary) waves are fastest and compressional; S (secondary) waves are slower shear waves that cannot pass through liquids; L (surface/Love) waves travel along the surface and cause the most damage. Secondary hazards include seismic shaking, liquefaction and tsunamis.
Prediction attempts include seismic gap theory and dilation. CCEA requires a small-scale case study of seismic activity (for example Tohoku in 2011) to evaluate preparation and response - building design, early-warning systems, drills and emergency planning.
Tap an item on the left, then its matching partner on the right.
Theory: evidence + convection/ridge push/slab pull; margins - constructive, destructive, conservative, collision
Landforms: ocean ridges, rift valleys, trenches, island arcs, fold mountains
Volcanoes: hazards vs benefits; hot spots; prepare and respond (case study)
Seismic: P, S and L waves; liquefaction, tsunamis; seismic gap and dilation; aseismic design
You have covered A2 1 Option A. Press Finish for your score.
You have worked through Plate Tectonics: Theory and Outcomes for CCEA A-level Geography. 🎉
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Next: test yourself in the Evaluate stage Confidence Quiz, then lock it in with Verify.