To work out distance.
Their depth perception is terrible because it's eyes can not focus on the same thing at once
To extend their camouflage even more by making themselves look as if they are a branch or leave swaying in the wind.
The toilet may rock back and forth due to an uneven or unstable floor, loose bolts securing the toilet to the floor, or a worn-out wax ring seal.
I believe that it might be because when you are a baby your mom and dad hold you and rock you back and forth when you cried. I don't believe that all people rock back and forth when they cry though.
The rhythm probably calms them.
There is nothing to it! Just sit on it and rock back and forth!
because that baby could go to sleep
Yes, the particles in a rock do vibrate back and forth, but the movement is very small and not easily detectable without special equipment. This vibration is a result of the thermal energy present in the rock causing the particles to jiggle in place.
p-waves
Both. Rock is a type of music. A rock is also a part of the sediment of the earth. The verb to rock means to sway back and forth.
It originally meant to sway back and forth, or side to side.
You should rock your vehicle, back and forth.
An EarthQuake Accurs