Here try this presentation, it should help :)
https://prezi.com/6ofdo3fadl9a/exothermic-and-endothermic-reactions-in-everyday-life/
Answer: Out of 118 elements, 94 occur naturally
Because of the tilt of the axis, causing some places to be a little farther than others, even if they are right next to each other, or halfway across the globe!
Its going to b 5,800,000 due to each Km being 1,000,000 Mm
Hope this helps :D