Convection Currents 0.0 / 5 ? GeographyPlate tectonicsA2/A-levelAQA Created by: abbyalevelsCreated on: 19-09-16 18:22 What releases heat in the core and mantle? Radioactive decay of some elements (like uranium) 1 of 8 What does this mean? It means the lower part of the asthenosphere heats up, and it becomes less dense and slowly rises. 2 of 8 What happens as it nears the top? It cools down and becomes more dense so sinks. 3 of 8 How does this continue? In a circular motion. 4 of 8 What effect does this have on tectonic plates? The current creates drag on the base of tectonic plates and hence they move 5 of 8 What theory is based on these currents? The plate tectonics theory. 6 of 8 What does this theory state in terms of plates? What is this also driven by? It states that these currents cause plates in the lithosphere to move. Also driven by sea floor spreading. 7 of 8 How much does the movement of plates vary by? 10mm/year to 100mm/year 8 of 8
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