Are you looking for soil reading comprehension passages and questions that cover soil horizons and types of soil with no additional prep? These reading passages are easy to use and your students will be engaged. They are the perfect addition to any soil unit. Students are able to practice their reading comprehension skills while learning more about the three main types of soil: loam, clay, and sand. The second reading passage covers the layers of soil (horizons): organic layer (humus), topsoil,