The image provided is a worksheet about the
Layers of Soil. The task involves identifying and describing the different layers of soil based on the diagram provided. Below is the solution with explanations for each layer:
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Soil Profile Layers
The soil profile typically consists of several distinct layers, also known as
horizons. These layers are formed over time due to various natural processes such as weathering, decomposition, and the movement of organic matter and minerals.
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1. Top Layer (A Horizon)
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Description: This is the
topmost layer of soil where most plants are found.
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Composition: It is made up of
organic matter (decayed plant and animal remains) and
minerals that have not been washed down deeper into the soil.
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Characteristics: Mostly
humus (decomposed organic material), which provides nutrients for plants. Many things live here except for the deepest roots, which extend into lower layers.
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2. Subsoil Layer (B Horizon)
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Description: This is the layer below the topsoil.
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Composition: It is composed mainly of
clay and minerals that have been leached (washed down) from the topsoil.
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Characteristics: This layer is often denser and less fertile than the topsoil because it lacks organic matter. However, it can still support some plant growth.
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3. Parent Material Layer (C Horizon)
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Description: This is the layer below the subsoil.
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Composition: It consists of partially weathered rock and mineral deposits.
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Characteristics: This layer is less affected by biological activity and is more compact compared to the upper layers.
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4. Bedrock (R Horizon)
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Description: This is the
lowest level of soil.
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Composition: It is solid rock that serves as the foundation for all the soil layers above it.
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Characteristics: The bedrock is the source of minerals that get broken down over time to form soil through weathering processes.
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Filling in the Worksheet
Based on the descriptions above, here is how you would fill in the blanks in the worksheet:
1.
The _______ layer of soil where most plants are found.
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Answer: Top
2.
Made up of _______ and _______ that has not been _______.
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Answer: Organic matter, minerals, washed down
3.
Mostly _______ that has been _______. Many things live here except for the _______.
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Answer: Humus, decomposed, deepest roots
4.
The lowest level of soil. It is _______.
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Answer: Bedrock
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Final Answer
Here is the completed worksheet:
```
Layers of Soil
1. The
top layer of soil where most plants are found.
2. Made up of
organic matter and
minerals that has not been
washed down.
3. Mostly
humus that has been
decomposed. Many things live here except for the
deepest roots.
4. The lowest level of soil. It is
bedrock.
```
Boxed Final Answer:
$$
\boxed{\text{Top, organic matter, minerals, washed down, humus, decomposed, deepest roots, bedrock}}
$$
Parent Tip: Review the logic above to help your child master the concept of soil layer worksheet.
