The day the Mesozoic died

What this video was about is it was explaining how the Mesozoic era age of dinosaurs died and how we can tell that by aging rock and by minerals. How this happened you may ask? Well lemme tell you. What happened is millions of years ago dinosaurs thrived on this planet we know now as "earth" but one day an asteroid about the size of mount everest hit the earth creating the biggest explosion ever. What happened after this is the debris that exploded into the air orbited the earth for a while before it fell down and with that in the air and all the smoke in the air, there wasn't no sunlight. Because of this no photosynthesis no photosynthesis means no plants no plants mean no food for herbivores no herbivores mean no food for carnivores and that means the extinction of dinosaurs.