It's time to roll up those sleeves and get a little dirty in the second lesson of this series on the science of food. Investigate where plants and animals get the minerals they need to live in this two-part exploration of soil. First, learners look carefully at soil samples, recording their observations and identifying the different materials they find. Then, plastic bottles filled with soil and water are shaken up in order to observe how the soil settles in different layers at the bottom. Measure these layers and discuss how soil is composed of a variety of materials. Use this activity to facilitate a better understanding of plant life, or as part of a lesson on geological processes.