kyle993
kyle993 Mar 5, 2026 • 0 views

Soil Horizon Quiz: Test Your AP Environmental Science Knowledge

Hey there! 👋 Getting ready for your AP Environmental Science exam? Soil horizons can be tricky, but I've got your back! This quick study guide and quiz will help you master the layers of soil. Let's dig in! 🪱
🌱 Environmental Science
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saunders.aaron3 Dec 31, 2025

📚 Quick Study Guide

  • 🌍 O Horizon (Organic Layer): This is the top layer, composed of organic matter like leaves, dead plants, and animal remains. It's crucial for nutrient cycling.
  • 🌱 A Horizon (Topsoil): A mix of organic matter and minerals. It's dark in color and where plants grow. It's subject to leaching.
  • ⛰️ E Horizon (Eluviation Layer): This is a zone of leaching, where minerals are transported downward. It's often light in color.
  • 🧱 B Horizon (Subsoil): Accumulation of minerals leached from above. It's often rich in clay.
  • 🪨 C Horizon (Parent Material): Partially altered bedrock. It's the transition zone between bedrock and soil.
  • 🏞️ R Horizon (Bedrock): Unweathered bedrock. It's the foundation of the soil profile.

Practice Quiz

  1. What is the uppermost layer of soil, primarily composed of organic material?
    1. A Horizon
    2. B Horizon
    3. O Horizon
    4. C Horizon
  2. Which soil horizon is characterized by the accumulation of leached minerals, often clay?
    1. A Horizon
    2. B Horizon
    3. C Horizon
    4. E Horizon
  3. In which horizon would you find partially weathered parent material?
    1. O Horizon
    2. A Horizon
    3. C Horizon
    4. R Horizon
  4. Which horizon is also known as topsoil?
    1. O Horizon
    2. A Horizon
    3. E Horizon
    4. B Horizon
  5. The process of leaching is most characteristic of which soil horizon?
    1. A Horizon
    2. B Horizon
    3. E Horizon
    4. C Horizon
  6. What is the name for the bottommost layer of soil, composed of bedrock?
    1. A Horizon
    2. B Horizon
    3. O Horizon
    4. R Horizon
  7. Which horizon is a mixture of organic material and minerals?
    1. O Horizon
    2. A Horizon
    3. B Horizon
    4. R Horizon
Click to see Answers
  1. C
  2. B
  3. C
  4. B
  5. C
  6. D
  7. B

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