How Did the Rock to My Backyard Originate?

Hundrautta: There are so many clues that geologists would use to figure out how the rock in your backyard formed. HundrautTA: We just look at it to see if it is made up of so many different types of minerals or bits and pieces. Sedimentary rocks, because they are formed from bits that are put together, sometimes they have tiny little bitty holes in them we call pores. So there are some clues that we look at.