Let's solve the problem step by step based on the image you described. The worksheet titled
"Our Earth" asks students to match descriptions with the correct layer of the Earth, using a diagram showing the four main layers:
Inner Core, Outer Core, Mantle, and Crust.
Here are the
descriptions provided in the boxes:
---
Description 1:
> This layer makes up two-thirds of the Earth’s mass and is about 1,800 miles deep. It is made up of a thick, solid, rocky substance, with portions that melt enough to flow.
-
Analysis:
- "Two-thirds of Earth’s mass" → This is a key clue. The
Mantle makes up about 70% of Earth’s mass.
- "About 1,800 miles deep" → The mantle extends from about 30 km (crust) to ~2,900 km depth — so 1,800 miles (~2,900 km) is roughly accurate.
- "Thick, solid, rocky substance with portions that melt enough to flow" → This describes the
mantle, which is mostly solid but has regions where rock flows slowly due to high heat and pressure.
✔ Correct Layer: Mantle
---
Description 2:
> Surprisingly, this layer is thought to be solid, even though it is farthest from the surface and beneath what's thought to be molten lava.
-
Analysis:
- "Farthest from the surface" → That would be the
inner core.
- "Thought to be solid" → Yes, the
inner core is solid despite being extremely hot, due to immense pressure.
- "Beneath what's thought to be molten lava" → The outer core is molten (liquid iron/nickel), and the inner core is solid and lies beneath it.
✔ Correct Layer: Inner Core
---
Description 3:
> This layer of the Earth is hard and composed of different minerals. It is the thinnest layer.
-
Analysis:
- "Hard" and "composed of different minerals" → Describes the
crust.
- "Thinnest layer" → The crust is indeed the thinnest layer (only 5–70 km thick).
✔ Correct Layer: Crust
---
Description 4:
> At a depth of 3000 miles beneath the surface, this layer is believed to be made of super-heated liquid molten rock. This lava is thought to be made of mostly iron and nickel.
-
Analysis:
- "3000 miles beneath the surface" → 3000 miles ≈ 4800 km. The
outer core starts at about 2,900 km and goes to 5,150 km depth — so this fits.
- "Super-heated liquid molten rock" → The
outer core is liquid iron and nickel.
- "Made of mostly iron and nickel" → Correct for the outer core.
✔ Correct Layer: Outer Core
---
Final Answers:
Match each description to the correct layer:
1.
Mantle
2.
Inner Core
3.
Crust
4.
Outer Core
---
Summary:
The Earth's layers from outside to inside are:
1.
Crust – thin, hard, rocky
2.
Mantle – thick, solid but can flow slowly
3.
Outer Core – liquid, made of iron and nickel
4.
Inner Core – solid, very hot, under extreme pressure
These answers align with the scientific model of Earth’s internal structure.
✔ Answer Key:
- Box 1 →
Mantle
- Box 2 →
Inner Core
- Box 3 →
Crust
- Box 4 →
Outer Core
Let me know if you'd like a printable version or explanation for kids!
Parent Tip: Review the logic above to help your child master the concept of introduction to earth science worksheet.
