This interactive worksheet helps students visualize and identify the different horizons of a soil profile.

The task involves labeling the layers of a soil profile and matching them with their descriptions. Below is a detailed explanation of how to solve this problem:

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Step 1: Understand the Soil Profile Layers

A typical soil profile consists of several distinct layers, each with its own characteristics. The most common layers are:

1. Topsoil (A Horizon):
- This is the uppermost layer.
- It is rich in organic matter and nutrients.
- It contains decomposed plant material and is usually dark in color.

2. Subsoil (B Horizon):
- Located below the topsoil.
- Contains less organic matter but more minerals.
- Often lighter in color than the topsoil.
- Minerals from the topsoil may leach into this layer.

3. Parent Material (C Horizon):
- Found beneath the subsoil.
- Consists of partially weathered rock fragments.
- Has larger particles compared to the topsoil and subsoil.

4. Bedrock (R Horizon):
- The solid rock layer beneath the parent material.
- Does not contain any organic matter or soil.

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Step 2: Match the Layers with Descriptions

The image shows four layers of soil. Let's analyze each layer and match it with its description:

#### Layer 1 (Top Layer):
- Appearance: Dark, fine particles with visible organic matter.
- Description: Topsoil (A Horizon).
- Characteristics: Rich in organic matter, dark in color, and nutrient-rich.

#### Layer 2:
- Appearance: Lighter in color, with smaller particles and some mineral deposits.
- Description: Subsoil (B Horizon).
- Characteristics: Less organic matter, lighter in color, and contains minerals leached from the topsoil.

#### Layer 3:
- Appearance: Larger particles, including rocks and gravel.
- Description: Parent Material (C Horizon).
- Characteristics: Partially weathered rock fragments, larger particles, and no organic matter.

#### Layer 4 (Bottom Layer):
- Appearance: Solid rock structure.
- Description: Bedrock (R Horizon).
- Characteristics: Solid, unweathered rock with no organic matter or soil.

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Step 3: Label the Layers

Based on the analysis above, label the layers as follows:

1. Top Layer: Topsoil (A Horizon)
2. Second Layer: Subsoil (B Horizon)
3. Third Layer: Parent Material (C Horizon)
4. Bottom Layer: Bedrock (R Horizon)

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Step 4: Color the Layers

Use different colors to represent each layer based on its characteristics:
- Topsoil (A Horizon): Dark brown or black (rich in organic matter).
- Subsoil (B Horizon): Light brown or tan (less organic matter).
- Parent Material (C Horizon): Gray or light gray (rock fragments).
- Bedrock (R Horizon): Solid gray or brown (solid rock).

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Final Answer

Label the layers as follows:
1. Topsoil (A Horizon)
2. Subsoil (B Horizon)
3. Parent Material (C Horizon)
4. Bedrock (R Horizon)

Boxed Final Answer:
\[
\boxed{\text{Topsoil (A Horizon), Subsoil (B Horizon), Parent Material (C Horizon), Bedrock (R Horizon)}}
\]