angle of tilt of the table acidity of the water amount of sediment eroded rate that sediment is eroded
A student wants to use a stream table to test the influence of water acidity on the erosion rate of a stream. Which variable should be constant in this experiment?

Options:
- angle of tilt of the table
- acidity of the water
- amount of sediment eroded
- rate that sediment is eroded

angle of tilt of the table