Earths Structure Worksheet with Answers | Exercises Earth ... - Free Printable

Let's solve this step by step.

---

Step 1: Fill in the blanks in the definitions

We’ll go through each definition and fill in the missing words based on scientific knowledge about Earth’s internal structure.

---

Crust - the outermost surface of the Earth. The crust is quite thin like the skin of an orange and is thinner under the oceans.

> ✔ Explanation: The crust is the thin, outermost layer of Earth. It's compared to the skin of an orange because it's relatively thin compared to the rest of the planet. Oceanic crust is thinner than continental crust.

---

Inner core - the solid iron-nickel center of the Earth that is very hot and under great pressure.

> ✔ Explanation: The inner core is the solid central part of Earth, made mostly of iron and nickel. Despite being extremely hot (about 5,500°C), it remains solid due to immense pressure.

---

Mantle - a rocky layer located under the crust. It is extremely hot – about 1,000 to 3,700 degrees C.

> ✔ Explanation: The mantle lies beneath the crust and is composed of dense, semi-solid rock. Temperatures vary from around 1,000°C near the top to nearly 3,700°C near the core.

---

Outer core - made of metal so hot that is liquid. This layer moves slowly and produces a magnetic field.

> ✔ Explanation: The outer core is liquid, primarily iron and nickel, and its movement generates Earth’s magnetic field via the geodynamo effect.

---

Step 2: Label the diagram

The diagram shows concentric circles representing Earth's layers. From outside to inside, they are:

1. Crust – the outermost thin layer.
2. Mantle – thick layer beneath the crust.
3. Outer core – liquid metallic layer.
4. Inner core – solid center.

So, label the diagram from outermost to innermost:

- Top arrow (outermost): Crust
- Second arrow: Mantle
- Third arrow: Outer core
- Innermost arrow: Inner core

---

✔ Final Answer:

#### Completed Definitions:

Crust - the outermost surface of the Earth. The crust is quite thin like the skin of an orange and is thinner under the oceans.

Inner core - the solid iron-nickel center of the Earth that is very hot and under great pressure.

Mantle - a rocky layer located under the crust. It is extremely hot – about 1,000 to 3,700 degrees C.

Outer core - made of metal so hot that is liquid. This layer moves slowly and produces a magnetic field.

---

#### Diagram Labels (from outside to inside):

1. Crust
2. Mantle
3. Outer core
4. Inner core

> 📌 Note: In most diagrams, the labels are placed next to the arrows pointing to each layer. So:
> - The outermost ring → Crust
> - Next ring → Mantle
> - Then → Outer core
> - Innermost circle → Inner core

---

This completes the worksheet! Let me know if you'd like a printable version or a labeled image description.