Soil Profile Exploration

Soil Profile Exploration

Read each question carefully and answer to the best of your ability. Refer to the soil profile diagram for assistance.

Observe the diagram below showing a typical soil profile.

1. The uppermost layer of soil, rich in organic matter, is called the  .

2. The layer often called the 'subsoil' is the   horizon.

3. Large rocks and weathered parent material are found in the   horizon.

4. The solid, unweathered rock beneath all other layers is known as  .

5. Which soil horizon is best for plant growth due to its high nutrient content?

6. The process that breaks down rock into smaller pieces, forming soil, is called:

7. The O horizon is primarily made up of weathered rock fragments.

8. The B horizon is often lighter in color and contains less organic matter than the A horizon.

9. Briefly describe the main difference between the A horizon and the B horizon.