These rifts in the earth, spewing lava, gases and ash, are forces of nature that are both a blessing and curse for human civilization. See All National Geographic Videos http://video.nationalgeographic.com/video/?source=4001 ➡ 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: http://bit.ly/FBNatGeo Twitter: http://bit.ly/NatGeoTwitter Instagram: http://bit.ly/NatGeoInsta About National Geographic: National Geographic is the world's premium destination for science, exploration, and adventure. Through their world-class scientists, photographers, journalists, and filmmakers, Nat Geo gets you closer to the stories that matter and past the edge of what's possible. Volcano 101 | National Geographic https://youtu.be/uZp1dNybgfc National Geographic https://www.