crazy – adj. very unusual
white-knuckle ride – n. an experience marked by, causing, or experiencing intense worry or nervousness
indication – n. something, such as a sign or signal, that points out or shows something
potential – n. a chance or possibility that something will happen or exist in the future
significant – adj. large enough to be noticed or have an effect
rapid – adj. happening quickly
polar – adj. of or relating to the North or South Pole or the region around it
incredible – adj. difficult or impossible to believe