Arrange the following in order or increasing acidic strength : HF, Hl, HBr, HCl

(Answer required ASAP) ​

Particles vibrate in a rigid structure and do not move relative to their neighbors.

Describe at least two advantages and two disadvantages of using hydropower as a source of energy.

As light moves from one material into the next, which of the following affects how much the light waves will refract, or bend? angle at which the ray strikes the medium color of the material density of the material temperature of the light wave