Educational worksheet for primary level students to identify and define sedimentary, igneous, and metamorphic rocks.

Let's solve this step-by-step based on the worksheet provided.

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Task Overview:

This is a 4th-grade science worksheet about types of rocks. The student needs to:
1. Identify each rock image as either Sedimentary, Igneous, or Metamorphic.
2. Match each rock type with its correct definition.

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Step 1: Analyze the Rock Images

#### Image 1 (Left):
- This rock is dark gray, porous, and has many holes.
- These characteristics are typical of igneous rocks, especially volcanic rocks like basalt or pumice.
- Porosity suggests it formed from magma that cooled quickly, trapping gas bubbles.
✔ Best match: Igneous rock

#### Image 2 (Middle):
- This rock shows distinct layers or bands of different colors (white, brown, black).
- Layering and banding are hallmarks of metamorphic rocks, such as marble or schist, formed under heat and pressure.
✔ Best match: Metamorphic rock

#### Image 3 (Right):
- This rock appears to be made of small particles or fragments cemented together.
- It looks like sediment has been compacted and hardened — characteristic of sedimentary rocks like conglomerate or sandstone.
✔ Best match: Sedimentary rock

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Step 2: Match Definitions to Rock Types

Now, let’s match the definitions to the correct rock types:

#### Definition 1:
> "Rock formed by layer of sediments. Compacting and cementation."
→ This describes sedimentary rock.
✔ Matches: Sedimentary rock

#### Definition 2:
> "When heat and pressure change a rock"
→ This describes metamorphic rock.
✔ Matches: Metamorphic rock

#### Definition 3:
> "Rock formed when magma cools and hardens."
→ This describes igneous rock.
✔ Matches: Igneous rock

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✔ Final Answers:

#### Under Each Image:
1. Left image (porous dark rock) → Igneous rock
2. Middle image (layered/banded rock) → Metamorphic rock
3. Right image (fragmented/grainy rock) → Sedimentary rock

#### Matching Definitions:
- Sedimentary rock → "Rock formed by layer of sediments. Compacting and cementation."
- Igneous rock → "Rock formed when magma cools and hardens."
- Metamorphic rock → "When heat and pressure change a rock"

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📝 Summary Table:

| Image | Rock Type | Definition |
|-------|---------------------|----------|
| Left | Igneous rock | Rock formed when magma cools and hardens. |
| Middle| Metamorphic rock | When heat and pressure change a rock. |
| Right | Sedimentary rock | Rock formed by layer of sediments. Compacting and cementation. |

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This activity helps students visually identify rock types and understand how their formation processes define them. Great for building foundational geology knowledge! 🌍岩石