Which of the following is NOT a type of soil particle: Rock. Which soil component makes up about 5% of an ideal soil: Organic Matter. Which soil component makes up about 45% of an ideal soil: Minerals. Which soil component makes up about 25% of an ideal soil: Both A and C. What is the area between soil particles called: Pore Spaces. Which soil particle is the largest in size: Sand. Which soil particle is the smallest in size: Clay. Which soil horizon is also known as “bedrock”: R Horizon. Which soil horizon is commonly called the subsoil: B Horizon. Which soil horizon is contains decomposed plants and animals: O Horizon. What is the definition of weathering: The wearing away of something by long exposure. What category is the following?Clay 50%, Silt 20%, Sand 30%: Clay. What category is the following?Clay 20%, Silt 40%, Sand 40%: Loam. What category is the following?Clay 40%, Silt 50%, Sand 10%: Silty Clay Loam. What category is the following?Clay 10%, Silt 70%, Sand 20%: Sandy Loam