shades of cyan

i was curious and thought to find out the difference between aqua, turquoise, cyan, teal and the range. some ppl tell me it's close to blue, some ppl say it's closer to green. so i just thought to increase my personal knowledge. i wikipedia http://en.wikipedia.org/wiki/Category:Shades_of_cyan

guess wad! i still dont think i can differentiate it when asked the next time. the range is too close and i guess to play it safe, i'll just answer that they are all in the "shades of cyan"! hahahaha..