Science Worksheets for Grade 3 Students | Worsheets library - Free Printable

Let’s go step by step to solve this worksheet.

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Part 1: Label the layers in the structure of the Earth

We are given four labels:
→ mantle
→ inner core
→ crust
→ outer core

Looking at the diagram (from outside to inside):

- The outermost layer is the thin brown shell — that’s the crust. We live on this layer.
- Below the crust is a thick yellow-orange layer — that’s the mantle.
- Inside the mantle is an orange-red layer — that’s the outer core.
- At the very center, the red circle — that’s the inner core.

So, matching the arrows from outer to inner:

Top arrow → points to the outermost layer → crust
Second arrow → points to the thick middle layer → mantle
Third arrow → points to the orange layer inside the mantle → outer core
Bottom arrow → points to the center red circle → inner core

Wait — let me double-check the arrow positions based on standard Earth layer diagrams:

Actually, looking again:

The top arrow points to the very outer edge → crust
The second arrow (slightly inward) → still in the thick yellow part → mantle
The third arrow → points to the orange ring → outer core
The bottom arrow → points to the center red dot → inner core

Yes, that matches.

So labeling order (top to bottom arrows):

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

But wait — the worksheet has 4 blank lines next to 4 arrows. Let’s assign them correctly:

Arrow 1 (top right, pointing to outermost layer) → crust
Arrow 2 (middle right, pointing to thick yellow layer) → mantle
Arrow 3 (lower middle, pointing to orange layer) → outer core
Arrow 4 (bottom, pointing to center) → inner core

✔ Correct.

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Part 2: Answer the questions

Question 1: Which layer do we live on?
→ We live on the crust. It’s the outermost solid layer where continents and oceans are.

Question 2: Which layer generates Earth’s magnetic field?
→ The outer core. It’s made of liquid iron and nickel that moves around, creating electric currents and thus the magnetic field.

Question 3: Which layer is the hottest?
→ The inner core. Even though it’s solid, it’s under extreme pressure and temperature — hotter than the surface of the Sun!

Question 4: On which layer does the crust float?
→ The crust floats on the mantle. Specifically, the upper part of the mantle (asthenosphere) is soft and allows the rigid crust plates to move on top.

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Final check:

Labels:
- Top arrow → crust
- Second arrow → mantle
- Third arrow → outer core
- Bottom arrow → inner core

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

All answers match scientific facts for Grade 3 level.

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Final Answer:
Labeling (from top to bottom arrows):
crust
mantle
outer core
inner core

Answers to questions:
Which layer do we live on? → crust
Which layer generates Earth’s magnetic field? → outer core
Which layer is the hottest? → inner core
On which layer does the crust float? → mantle