Law

I told my friend a riddle the other day and it had to do with the earth and the moon. I stumped him. I said the earth wasnt earth until the moon was created. But he said it was always earth but with poison gasses and no moon. We arugued and asked people for the last 2 days of school and the response was 50/50. SO...would the earth be earth even without the moon and life? Or would you say the earth wasnt earth until an asteroid (or whatever else you think) hit it? Please post im going to send him this link. Also another question i just thought up! Who named the earth and how did all of mankind come to an agreement naming it earth? Your response is greatly appreciated.

On the news there was a man who flew into space differently and now its raising questions of spacetourism. I dont know exactly how it worked so can you explain. How much more will we advance in space travel? (sorry about the huge edit i had to go to the store and i had to type this out quickly)

Hi im new here and i just have a stupid question, whats the difference between evolution and mutation if they both have to do with the body changing someway? Im slow LOL so just walk me through it.