Question

What was difficult to understand about the earth when the jet was flying

Answer 1

Answer:

But it was difficult to understand that the men on the earth found causes to hate each other, to build walls across cities and to kill. From that height, it was not clear why.

Explanation:

Answer 2

Answer:

When the jet rose six miles high, it was clear the earth was round and that it had more sea than land. But it was difficult to understand that the men on the earth found causes to hate each other, to build walls across cities and to kill.