20,000 because I did the quiz and got it right txt me if you need help
<span>Artificial fertilizers are made chemically. They emphasize three main</span>
<span>When a glass fragment in silicon oil is heated and cooled, the refractive index of the glass has been found when both the becke lines and the glass will disappear. As the oil refractive index changes in the process of heating so that it equals the glass refractive index, the fragment edges fade.</span>
Answer: Sound waves carry energy parallel to the motion of the wave, while light waves carry energy perpendicular to it.
Explanation: trust me