This worksheet provides a complete review of Earth's layers, challenging students to label diagrams and match descriptions to geological terms.

Let's solve the Earth's Structure Worksheet step by step and provide clear explanations for each answer.

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A. Answer these questions

1. Which layer of the Earth do we live on?
✔ Crust
*Explanation:* The crust is the thin, outermost solid layer of the Earth. It includes both land (continental crust) and ocean floor (oceanic crust), and this is where all living organisms, including humans, reside.

2. Which layer is the hottest and innermost of Earth?
✔ Inner Core
*Explanation:* The inner core is the deepest and hottest part of the Earth, with temperatures reaching up to about 5,700°C (as hot as the surface of the Sun). It is made of solid iron and nickel due to extreme pressure.

3. Which layer is the thickest?
✔ Mantle
*Explanation:* The mantle lies between the crust and the core and makes up about 84% of Earth’s volume. It extends from about 30 km below the surface to 2,900 km deep, making it the thickest layer.

4. Which layer surrounds the inner core and is made up of liquid Nickel and Iron?
✔ Outer Core
*Explanation:* The outer core is a fluid layer composed mostly of liquid iron and nickel. It surrounds the solid inner core and is responsible for generating Earth’s magnetic field through the movement of molten metals.

5. Which layer generates Earth’s magnetic field?
✔ Outer Core
*Explanation:* The motion of molten iron and nickel in the outer core creates electric currents, which generate Earth’s magnetic field — a process known as the geodynamo effect.

6. On which layer does the crust float?
✔ Mantle
*Explanation:* The crust floats on top of the more ductile (plastic-like) upper part of the mantle, called the asthenosphere. This floating behavior allows tectonic plates to move slowly over time.

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B. Label the layers in the structure of the Earth!

From outermost to innermost, the layers are:

1. Crust → Outermost layer (thin green/blue surface)
2. Mantle → Thick yellow layer beneath the crust
3. Outer Core → Orange layer surrounding the inner core
4. Inner Core → Red center

So, label them in order from outside to inside:
- Top line: Crust
- Second line: Mantle
- Third line: Outer Core
- Bottom line: Inner Core

> 🔹 Use the diagram: The outermost layer is the crust, then mantle, then outer core, then inner core.

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C. Draw a line to match each layer to its description

Match each term on the left to the correct description on the right:

| Layer | Match |
|------|-------|
| Continental crust | ➔ the part of the Earth we live on
| Oceanic crust | ➔ layer directly under the oceans
| Mantle | ➔ Where volcanic lava comes from *(lava originates from the upper mantle)*
| Outer core | ➔ made of liquid iron and nickel
| Inner core | ➔ Solid ball as hot as the surface of the sun

✔ Final Matching:
- Continental crust → the part of the Earth we live on
- Oceanic crust → layer directly under the oceans
- Mantle → Where volcanic lava comes from
- Outer core → made of liquid iron and nickel
- Inner core → Solid ball as hot as the surface of the sun

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✔ Summary of Answers

#### Part A:
1. Crust
2. Inner Core
3. Mantle
4. Outer Core
5. Outer Core
6. Mantle

#### Part B:
Label from outside to inside:
1. Crust
2. Mantle
3. Outer Core
4. Inner Core

#### Part C:
- Continental crust → the part of the Earth we live on
- Oceanic crust → layer directly under the oceans
- Mantle → Where volcanic lava comes from
- Outer core → made of liquid iron and nickel
- Inner core → Solid ball as hot as the surface of the sun

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This worksheet helps students understand Earth’s internal structure and how each layer contributes to geological processes like volcanism and magnetism. 🌍✨