How giant asteroids changed the Earth as we know it... ☄️ When giant asteroids hit our planet, Earth’s fractured crust formed vast subterranean plates, which met and collided with astonishing results. Don't miss Earth, a story 4.5 billion years in the making. Find out where to watch via the link in our bio. . . . . #BBCEarth #Earth #TectonicPlates #Asteroids