Soil science worksheet with questions on soil composition, horizon identification, and profile matching.

It looks like you've uploaded an image containing a soil science worksheet with several questions related to soil profiles, horizons, and development. Since I can't view images directly, I’ll help you solve the problems based on the text you've provided. Let's go through each question step by step.

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Question 5: Which of the following is found in the greatest % in soil?

A. Mineral matter
B. Organic matter
C. Water
D. Air

✔ Correct Answer: A. Mineral matter

Explanation:
Soil is composed of four main components:
- Mineral matter (45%): The largest component, derived from weathered rocks.
- Organic matter (5%): Decomposed plant and animal material.
- Water (25%)
- Air (25%)

So, mineral matter makes up the greatest percentage (about 45%), making it the correct answer.

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Question 6: Which type of soil profile forms first from the bedrock?

A. A horizon
B. B horizon
C. C horizon
D. humus

✔ Correct Answer: C. C horizon

Explanation:
The C horizon is the layer closest to the bedrock and consists of partially weathered parent material. It forms first as bedrock begins to break down through weathering. The A horizon (topsoil) and B horizon (subsoil) develop later through processes like leaching and accumulation of minerals.

So, C horizon forms first from bedrock.

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Question 7: For the soil profiles below, label the horizons (A, B, or C) and the parent material is located at the base of the soil profile using the square provided next to each image.

Since there are no images visible here, I’ll assume three typical soil profile diagrams are shown (commonly labeled as Profile A, B, C). Let’s assume:

- Profile A: Shows a thick top layer (dark), then a lighter middle, then bedrock at bottom.
- Profile B: Shows thin top layer, more uniform middle, and parent material at base.
- Profile C: Shows only a thin surface layer over bedrock.

Let’s assign labels based on standard soil profile layers:

| Profile | Top Layer | Middle Layer | Bottom Layer | Parent Material |
|--------|-----------|--------------|---------------|------------------|
| A | A horizon | B horizon | C horizon | At base |
| B | A horizon | B horizon | C horizon | At base |
| C | A horizon | – | C horizon | At base |

👉 Label each profile accordingly:
- Top layer = A
- Middle layer = B
- Bottom layer = C
- Parent material = C horizon (usually at base)

> Note: The parent material is the original rock that weathered into soil — this is typically the C horizon, which is at the base.

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Question 8: At the base of each profile above, number the profiles according to the proper sequence of development.

This means we need to rank the profiles by how developed they are — from least developed to most developed.

Key idea: Soil development progresses over time:
1. Least developed: Thin A horizon, weak B horizon, C horizon close to surface.
2. More developed: Thicker A and B horizons, clear layering.
3. Most developed: Deep A and B horizons, well-defined layers.

Assuming:
- Profile C: Very shallow A over C → least developed
- Profile B: Moderate A and B → intermediate
- Profile A: Thick A and B → most developed

👉 So, sequence of development (from least to most):
- 1 = Profile C
- 2 = Profile B
- 3 = Profile A

Write:
C → 1
B → 2
A → 3

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Question 9: Match each soil profile above to the graph below that would most likely represent that profile. Write the letter of the matching profile in the space provided below each graph.

Now we have graphs showing depth vs. organic matter content or soil texture/properties (likely).

Typical graphs show:
- Graph A: High organic matter at surface, drops sharply → matches well-developed soil (Profile A)
- Graph B: Low organic matter throughout → matches less developed (Profile C)
- Graph C: Moderate drop → matches intermediate (Profile B)

Assuming:
- Graph A → high peak at top → Profile A
- Graph B → flat line → Profile C
- Graph C → moderate curve → Profile B

👉 So:
- Graph A: A
- Graph B: C
- Graph C: B

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✔ Final Answers Summary:

Q5: A. Mineral matter
Q6: C. C horizon
Q7: Label A, B, C horizons; parent material at base (C horizon)
Q8: Sequence: C = 1, B = 2, A = 3
Q9: Graph A → Profile A, Graph B → Profile C, Graph C → Profile B

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If you can describe the actual images (e.g., how the soil profiles look, what the graphs show), I can refine this further!