This resource includes an activity on assessment of understanding porosity and a table showing porosities of common materials. Porous sandstone.Click on the image to download the pdf showing a set of multiple choice questions. Assessment of understanding of porosityThis set of multiple-choice questions assesses understanding of porosity. Porous sandstone as seen under a microscope.Click on the image to download a pdf showing porosties of various materials. Porosities of natural and manufactured rock and mineral based materialsThis table lists the range of porosities and bulk densities of various common materials. Click here to visit this resource Topic: Rocks, Minerals and FossilsLevel: CollegeRole: Students, Teachers