The answer you’re looking for I believe, is Commerce.
The treaty of Versailles was an unfair treaty because they blamed everything on Germany and restricted its capabilities as a country and they had to pay for the war to the other states/counties
A. first the terrorists had to hijack the planes to kill the 3k people
In the passage this question was provided for, you should have been able to find the fallowing text, "Therefore it is hypothesized that Earth’s magnetic field is being produced by ionized iron moving about in the Earth’s liquid outer core. If Earth didn’t have a liquid (iron) outer core the Earth wouldn’t have its magnetic field."
Answer: Magnetic Field