Earthquakes are unpredictable and can strike with enough force to bring buildings down. Find out what causes earthquakes, why they're so deadly, and what's being done to help buildings sustain their hits. ➡ Subscribe: http://bit.ly/NatGeoSubscribe ➡ Get More 101 Videos: http://bit.ly/NatGeo101 About National Geographic’s 101 Series: Explore and experience the forces that shape the world around us. Get More National Geographic: Official Site: http://bit.ly/NatGeoOfficialSite Facebook: ht