I just recently did this for my science class! it's really fun.
Basically the oobleck is a mix of cornstarch and water. Its a Non newtonian fluid meaning it doesn't share the same properties as for this particular mixture the oobleck looks like a liquid but in reality is both a liquid and solid, if you try to grab it really fast its solid if you just let it go though your fingers slowly it flows like a liquid. The Oobleck is very similar to quick sand!
You should try it!
hope this helps.