I CAN: describe how earthquakes happen using words like stress and strain. Words Compression stress and plastic deformation Definitions Compression: force pushing rocks together Connection or relationship Enough compression stress can cause a rock to experience plastic deformation. Plastic deformation: when rocks permanently deform/break Tension stress and elastic limit Tension stress: force pulling rocks apart Too much tensional stress will cause a rock to reach it’s elastic limit. Elastic limit: point at which a rock cannot handle any more stress Stress and earthquake Stress: force on a rock Too much stress can break a rock, causing an earthquake Earthquake: released energy from plates shifting. Elastic limit and plastic deformation See above Divergent boundary and tensional stress Divergent: plates separating A rock must reach it’s elastic limit before it experiences plastic deformation Tensional stress can cause a divergent boundary Tensional stress: see above Convection currents and stress Convection currents: A cycle of warm material rising/cool sinking in the mantle. Stress: see above Convection currents in the mantle move, creating stress on the plates above them. Stress, elastic limit AND earthquake See above Too much stress on a plate will cause the plate to reach it’s elastic limit, which can then cause an earthquake.