Venezuela sits on one of the largest oil deposits in the world – but not all oil is created equal. CBC’s Johanna Wagstaffe explains how millions of years of buried seabeds and oil-eating bacteria turned that reserve into some of the heaviest, hardest-to-extract crude on the planet. »»» Subscribe to CBC News to watch more videos: http://bit.ly/1RreYWS For breaking news, video, audio and in-depth coverage: https://www.cbc.ca/news Follow CBC News on TikTok: https://www.tiktok.com/@cbcnews