In a wave, what is a distance between two crests or two troughs called? is the distance between two crests or two troughs.

the distance between 2 crests & 2 troughs is known as wavelength

Explanation:

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.