Elegant monogram letter B with decorative swirls and floral accents.

You’re working on a “Layers of the Earth Worksheet Advanced”, which includes labeling a cross-section of the Earth and answering three questions about the crust.

Since I can’t view images, I’ll help you solve this based on standard Earth science knowledge and the typical structure of such worksheets.

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## 🔬 PART 1: Labeling the Diagram

The diagram likely shows a cutaway of the Earth with lines pointing to different layers. Based on the depth markers shown (e.g., 2,900 km, 5,100 km, 6,378 km), here’s how to label the layers from outermost to innermost:

✔ Correct Labels (from top to bottom):

1. Crust — The very outermost layer. Thin, solid, and where we live.
2. Mantle — Below the crust. Mostly solid but can flow slowly over time. Extends down to ~2,900 km.
3. Outer Core — Liquid layer made mostly of iron and nickel. Starts at ~2,900 km and ends at ~5,100 km. Labeled “Liquid” in your diagram.
4. Inner Core — Solid center of the Earth. Made of iron and nickel under extreme pressure. Starts at ~5,100 km and goes to the center (~6,378 km). Labeled “Solid”.

> 💡 Note: The “To scale” circle on the left is likely showing the relative sizes of the core layers compared to the whole Earth — emphasizing how thin the crust is.

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## 📝 PART 2: Answering the Questions

1. What are the two types of crust?

✔ Continental crust and Oceanic crust

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2. How are the two types alike? How are the two types different?

✔ Similarities:
- Both are the outermost solid layer of the Earth.
- Both are composed of silicate rocks (rich in silicon and oxygen).
- Both sit atop the mantle.

✔ Differences:

| Feature | Continental Crust | Oceanic Crust |
|---------------------|-----------------------------------|--------------------------------|
| Thickness | Thicker (30–50 km) | Thinner (5–10 km) |
| Density | Less dense (~2.7 g/cm³) | More dense (~3.0 g/cm³) |
| Composition | Rich in silica and aluminum (felsic) | Rich in iron and magnesium (mafic) |
| Age | Older (up to 4 billion years) | Younger (less than 200 million years) |
| Location | Forms continents | Forms ocean floors |

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3. In what layer of the Earth are the deepest mines and drill holes found?

✔ Crust

> 🌍 Explanation: The deepest mine ever dug is the Mponeng Gold Mine in South Africa, reaching about 4.0 km deep. The deepest drill hole is the Kola Superdeep Borehole in Russia, which reached 12.3 km — still only a tiny fraction of the way through the crust (which averages 30–50 km thick). No human-made hole has ever reached the mantle.

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## 🧾 Final Summary for Worksheet

Labeling Answers:

- Top line → Crust
- Next layer → Mantle
- Liquid layer → Outer Core
- Solid center → Inner Core

Written Answers:

1. The two types of crust are continental crust and oceanic crust.

2.
Alike: Both are solid, outermost layers made of silicate rocks.
Different: Continental crust is thicker, less dense, older, and forms continents; oceanic crust is thinner, denser, younger, and forms ocean floors.

3. The deepest mines and drill holes are found in the crust.

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Let me know if you need this formatted as a printable answer sheet or want help drawing the labels! 🌎📚