can someone please explain this

Answer:
1. Crest
2. Trough
3. Amplitude
4. Wavelength
Explanation:
Crest is the peak (highest point) of the wave.
Trough is the lowest point.
Amplitude is the height of the wave.
Wavelength is the distance from one point to another.
1.crest
2.trough
3.amplitude
4.wavelength
hope it helps