I am doing my science fair project on soil filtering ?

So I wanted to do my science fair project on the filtering of soil. I planned to take different types of soil and filter liquids through them such as gasoline, water, etc. I am trying to think of a hypothesis.. I need to know how to explain why I think that sand will filter easier. Is that an accurate hypothesis ?

So far I only have sand and dirt as my "soils".

Can anyone help me by telling me

1.) What other types of soil I can use.

2.) Why a type of soil would filter easier. (Statement)

3.) Other liquids I can use ?

Also, is there any other way to make this project a "higher level" project?? I'm in high school..

My proposal is due tomorrow.

THANK YOUUU !

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