TOTAL GRAPHIC GLITCH

I was flying around, when a huge graphic glitch popped up. This has happened to many people, including some YouTubers, the blocks seemed to be popping up, and sometimes, when you are flying over... let`s say a grass block, the same glitch happens, but the "pop" texture is cobblestone. 1: Play Minecraft for about 30 mins. 2: Fly around.