==Key Stage 4==
===Meaning===
An '''Earthquake''' is when the ground undergoes a violent shaking motion. This often results in damage to the [[earthquakelocal]] is when the ground shakesenvironment and severe loss of life.
===About Earthquakes===
: '''Earthquakes''' occur along all three types of [[EarthquakeTectonic Plate Margin]] when tension builds up as the [[Tectonic Plates|plates]] move. At [[Destructive Plate Margin]]s as the two plates move down past each other into the mantle [[friction]] causes tension to build up and therefore the plates get stuck. As the plates are released and jerk away from each other they release shock waves that that spread from the [[Focus|focus]] deep in the [[mantle]] where the plates are coming together. The shock waves are then felt on the surface of the [[crust]] and they are usually caused by most strongly felt at the [[Epicentre]] which is the point directly above the [[focus]]. This is an '''earthquake'''. At [[Tectonic Conservative PlateMargin]]s as the plates grind past each other [[friction]] causes tension to build between the plates as they move and this means that they eventually become stuck. As the plates are released and jerk away from each other they release shock waves that that spread from the [[Focus|tectonic focus]] deep in the [[mantle]]. The shock waves are then felt on the surface of the [[crust]] in the form of an '''earthquake'''. The shock waves are most strongly felt at the [[Epicentre]] which is the point directly above the [[focus]]. At [[Constructive Plate Margin]]s the plates are moving away from each other and this causes cracks in the platesas they move. Tension then builds in these cracks and is eventually released in the form of shock waves that can be felt of the surface of the earth at the [[crust]] rubbing against as an '''earthquake'''. Earthquakes come in a variety of strengths therefore there is a scale that shows you how strong each otherearthquake is and how much damage it is likely to do. This is called the '''moment magnitude scale'''. This scale measures the amount of energy released by an earthquake and is measured [[Logarithmic|logarithmically]]. This means that a magnitude 2 earthquake is ten times stronger than a magnitude 1 earthquake. Earthquakes below magnitude 6 only cause slight damage to buildings and earthquakes magnitude 7 and above can cause high levels of damage and large loss of life.
==Beyond the Curriculum==
{{#ev:youtube|https://www.youtube.com/watch?v=e7ho6z32yyo}}