Earthquakes are powerful natural phenomena that can cause much destruction. Once thought to be the movements of a large turtle or elephant supporting the Earth, earthquakes are now understood to be the seismic release of energy within the Earth's crust.
The first types of waves are P-waves (primary waves). They are longitudinal waves that travel quickly through the Earth's interior.
Then, come the S-waves (secondary or shear waves). These waves are transverse waves that travel only through the Earth's solid mantle, and not through its liquid outer core.
Last, come the surface waves (Love waves and Raleigh waves) that travel through the Earth's crust and causes much damage to buildings and infrastructure.
By understanding Earthquakes better, scientists are hoping to best prepare us with stronger buildings and maybe even a warning system.
Brainpop:
https://www.brainpop.com/science/earthsystem/earthquakes/
https://www.brainpop.com/science/earthsystem/tsunami/
Activity:
http://www.sciencecourseware.com/virtualearthquake/vquakeexecute.html
http://www.dropcoverholdon.org/beatthequake/game/
http://www.stopdisastersgame.org/en/playgame.html
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