What is soil? Did you know that it's a mixture of four main ingredients: weathered rock, organic matter, air, and water? With this science worksheet, your students will find out much more about this topic. First, they'll read an informational text on what soil is and why it is important. Then, their nonfiction comprehension skills will be challenged by having them write what they think the main idea of the passage is. This resource pairs well with the science curriculum in second grade.