Alice did an experiment to find the relationship between the angle at which a ray of light strikes a mirror and the angle at which the mirror reflects the light. she placed a ray box in front of a mirror. she changed the angle at which the light from the ray box struck the mirror and noted the corresponding angle at which the mirror reflected the light. which of the following is the control variable in this experiment? the ray box used as the source of light the direction along which the light moves angle at which the light from the ray box strikes the mirror angle at which the mirror reflects the light from the ray box

The angle at which the light from the ray box strikes the mirror  

Explanation:

The independent variable is the variable that the investigator changes. The question states that Alice "changed the angle at which the light from the ray box struck the mirror."

The light box and the direction of the ray are wrong. They are controlled variables.

The angle of the reflected light is wrong. It is the dependent variable.

gravity causes stares to cluster i think so

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.