PLEASE ANSWER ASAP!
For her school Science ft Alyssa designs an experiment to learn more about
erosion. Her experimental set up is shown below
Using the illustration shown above, determine which of the following statements best
describes the independent variable itest variable). this experiment:



A The speed she pours the water, since it is the same for all trials.

B The amount of water she pours, because the amount she pours is the same.

C The height of the tray, because this is a change that may cause and effect on the experiment.


D The mass of sand that collects at the bottom of the tray, because this is what is being measured or observed.