summarize this:
Earthquakes are primarily caused by the release of energy in the Earth's crust, resulting in seismic waves. This can happen due to tectonic plate movements, volcanic activity, and human-induced activities. The movement and interaction of tectonic plates is the most common cause, as stress and strain build up along their boundaries and eventually lead to an earthquake. Volcanic activity can also cause earthquakes, and human activities like mining and hydraulic fracturing can alter the stress distribution and trigger earthquakes. In summary, earthquakes are a natural result of the dynamic processes occurring within the Earth's crust.