If you see that a hot-air balloon is rising above the top of a hill, what is the top of the hill called?
A.Coordinate system
B. Delta point
C. Reference point
D. Distance system

Question

If you see that a hot-air balloon is rising above the top of a hill, what is the top of the hill called?
A.Coordinate system 
B. Delta point
C. Reference point
D. Distance system

osprey · Answer

C ? The answer could be in the wording of the question. "above the top of the hill". You're seeing the balloon with REFERENCE to the top of the hill ... It's in the COORDINATE system of the land surrounding the hill, you may not know what the distance is, and the "delta point" sounds vaguely like military jargon. Similar thing in a laboratory. Any mark you put on a bench - piece of tape - can act as a reference point. "Benchmark". http://perendis.webs.com

osprey · Answer

Merci beaucoup, bon chance, et bon voyage

samantha2234 · Answer

Thank you, and I did very well, and I am glad I gave you a medal you deserve it!

osprey · Answer

Merci beaucoup encore ... J'ai oublie lequelle je disais. (thanks very much, I've forgotten what I was going to say). Viva La France ? (Je ne suis pas Francais, comme, peut etre, vous comprenez ...)