Let's solve the problem step by step.
The image is a worksheet titled
"Identify the Earth's Layers", and it asks you to label the different interior layers of the Earth with their names, depths, and states of matter. The diagram shows a cross-section of the Earth with four distinct layers, starting from the outermost layer (the crust) to the innermost.
We already have the
first layer labeled:
-
Name: Crust
-
Depth: 5–70 km
-
State of Matter: Solid
Now, let’s identify the remaining three layers in order from top to bottom:
---
🔹 Layer 2: Mantle
-
Name: Mantle
-
Depth: ~2900 km (from the base of the crust to the core-mantle boundary)
-
State of Matter:
Semi-solid (plastic) or
viscous solid — it behaves like a thick fluid over long periods due to high pressure and temperature, but is technically solid. Often described as
solid but can flow slowly.
> Note: The mantle is mostly solid but has the ability to flow very slowly over geological time due to convection currents.
---
🔹 Layer 3: Outer Core
-
Name: Outer Core
-
Depth: ~2900 km to ~5150 km (from the bottom of the mantle to the top of the inner core)
-
State of Matter:
Liquid
> The outer core is composed mainly of iron and nickel in a molten state. It is responsible for generating Earth’s magnetic field through the geodynamo process.
---
🔹 Layer 4: Inner Core
-
Name: Inner Core
-
Depth: ~5150 km to ~6371 km (center of the Earth)
-
State of Matter:
Solid
> Despite being extremely hot (over 5000°C), the immense pressure at the center keeps the inner core in a solid state.
---
✔ Final Answer:
Fill in the blanks as follows:
#### Second Layer (below the crust):
-
Name: Mantle
-
Depth: 2900 km
-
State of Matter: Semi-solid (or viscous solid)
#### Third Layer:
-
Name: Outer Core
-
Depth: 2900–5150 km
-
State of Matter: Liquid
#### Fourth Layer (innermost):
-
Name: Inner Core
-
Depth: 5150–6371 km
-
State of Matter: Solid
---
🌍 Summary of Earth's Interior Layers:
| Layer | Depth | State of Matter |
|-------------|---------------------|----------------------|
| Crust | 5–70 km | Solid |
| Mantle | 70–2900 km | Semi-solid (solid, flows slowly) |
| Outer Core | 2900–5150 km | Liquid |
| Inner Core | 5150–6371 km | Solid |
This completes the task! You now have all the correct information to fill in the worksheet.
Parent Tip: Review the logic above to help your child master the concept of structure of the earth worksheet.
