What is the independent variable and the dependent variable in Does Water Cause Erosion science fair project?

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The actual question of my project is Does Dripping Water Cause Erosion. Im confused about the Materials and What the independent variable would be





What other materials do i need other than Soap or rocks water and a pan





Would the independent variable be The rocks the water.





Since we have to do three trials would i change anything like the water rock...





As you could probably tell ive never been in a science fair before. Thanks!|||You could have two pans filled with an equal amount of sand, with the same shape and density, so that they are identical to each other. Set them up on a light slope so that they can "erode."



Then set up a dripper over each pan of water, being careful to be sure they are at the same height. So far, everything is identical. Now the independent variable that you are going to introduce is the rate that the water drips over each pan. Set one dripper up so it drips at, say, 5x the rate of the other. You should see the sand in that pan erode a lot faster.



In this experiment, the independent variable is the rate at which water drops on the sand.



The dependent variable is the rate at which the sand erodes (it depends on the rate of the water dripping).



You could also experiment by changing the height of the dripper, and keeping the drip rates the same. If you do that, the independent variable is the height of the dripper, and the dependent variable is still the rate of erosion.



A properly controlled experiment has only one independent variable, otherwise you won't know what is causing the dependent variable.



Hope that helps!