Answer:
1. Crest
2. wavelength
3. Trough
4. amplitude
Step-by-step explanation:
1. is Crest due to it being at the very top point of the wave, meaning it was at its maximum value.
2. is Wavelength due it showing the length between the two waves
3. is Trough due to it being the point of the wave
4. is Amplitude due to it being at a position where it is showing the distance from the resting point to where the wave began to form.