How Big Is Our Earth?

If a rope wrapped around the whole Earth had to rise 30 cm so a rabbit could get under it, how much longer would the rope need to be? Before the answer, we find out how big the Earth really is: its diameter and the distance around it, how long a trip around it takes, how Eratosthenes measured it with a stick and a shadow, the Earth shrunk to a classroom globe, the horizon, the deepest hole, all the water on Earth, and Jupiter and the Sun. Chapters: 0:00 The rope puzzle 0:25 The size of the Earth 1:18 Around the Earth 2:12 The spinning Earth 2:39 How Eratosthenes measured the Earth 4:05 The Earth as a globe 4:56 Why does the Earth look flat? 5:17 The deepest hole 5:41 Water on Earth 6:02 The Earth and its neighbors 6:22 The rope puzzle answered 7:48 Recap #earth #science #ngertikok