How can you prove that the Surface Area can affect the Rate of Reaction?

-First, have Marble Chips inside a Dilute Hydrochloric Acid Solution, with a Gas Syringe connected at the Top, for the Carbon Dioxide -Them, in a set amount of time, measure the Amount of Gas Produced -Make a Graph, with Volume of Gas on Y Axis, and Time on X Axis -Then Repeat this Experiment, with all the Variables the same, EXCEPT crunch the Marble Chips even more, and then Record it on the Graph -Then, use Powdered Chalk, which is pretty much the Same Thing. -What you will Evidently see, is that the Finer, and bigger the Surface area: Volume Ratio is, the Materials are, the Faster the Reaction will be.