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Copy of 5. RELATIVE AGES WORKSHEET.pdf - Name: Hour: Directions ... - Free Printable

Copy of 5. RELATIVE AGES WORKSHEET.pdf - Name: Hour: Directions ...

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Show Answer Key & Explanations Step-by-step solution for: Copy of 5. RELATIVE AGES WORKSHEET.pdf - Name: Hour: Directions ...
It looks like you've uploaded an image containing a geology or structural geology exercise titled "RELATIVE AGE", which involves interpreting the relative ages of geological features based on cross-sections and stratigraphic principles.

Since I can't view images directly, I’ll need you to describe the content of the image or provide details about the problem (e.g., what kind of diagrams are shown, what features are labeled, and what question is being asked). However, based on the title and typical structure of such exercises, here’s a general explanation of how these problems are solved:

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🔍 Common Elements in "Relative Age" Problems:


These types of questions usually involve analyzing a series of geological cross-sections or maps and determining the relative sequence of events (i.e., which feature formed first, second, etc.) using principles of relative dating.

The key principles include:

1. Principle of Superposition: In undisturbed sedimentary rock layers, the oldest layers are at the bottom, and the youngest are at the top.
2. Principle of Original Horizontality: Sedimentary layers are deposited horizontally or nearly horizontally.
3. Principle of Cross-Cutting Relationships: A fault or igneous intrusion that cuts across a rock layer is younger than the layer it cuts.
4. Principle of Inclusions: Fragments within a rock are older than the rock itself.
5. Principle of Unconformities: An unconformity represents a gap in the geologic record; the rocks below are older than the unconformity.

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🧩 Typical Task:


You might be asked to:
- Number the rock layers and structures in order from oldest to youngest.
- Identify the type of unconformity (angular, disconformity, non-depositional).
- Determine the sequence of events (e.g., deposition, folding, faulting, erosion, intrusion).

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How to Solve Step-by-Step:


Let’s assume the image shows several cross-sections with labeled rock layers, faults, folds, intrusions, and unconformities.

1. Identify all rock units and structures (sedimentary beds, igneous dikes, faults, folds, unconformities).
2. Apply the principle of superposition to sedimentary layers.
3. Look for cross-cutting relationships — any fault or dike cutting through a layer must be younger.
4. Find unconformities — they indicate periods of erosion or non-deposition and are younger than the rocks they overlie.
5. Determine the order of events by working backward: start with the oldest (bottom-most) and move up.
6. Number the events in chronological order.

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Example:


Suppose one diagram shows:
- Horizontal sedimentary layers (A, B, C, D) from bottom to top.
- A fold (F) deforming them.
- A fault (Ft) cutting through the folded layers.
- An igneous dike (I) cutting across the fault.

Then the order would be:
1. Deposition of A → B → C → D
2. Folding (F)
3. Faulting (Ft)
4. Intrusion of dike (I)

So, dike is youngest, layers are oldest.

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❓Please Provide:


To give you a precise solution, please describe:
- What the diagrams show (e.g., layers, folds, faults, dikes, unconformities).
- Any labels or numbers present.
- The specific question being asked (e.g., “List the events in order” or “Which feature is oldest?”).

Once I have that, I can walk you through the exact answer and reasoning!
Parent Tip: Review the logic above to help your child master the concept of relative age worksheet.
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