Layers of The Earth Worksheet | PDF - Free Printable

Here’s the completed matching and labeling for the “Layers of the Earth” worksheet, with clear explanations:

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✔ Matching Layers to Definitions

1. lithosphere →
*Made up of the crust and a tiny bit of the upper mantle, this layer is divided up into constantly moving plates of solid rock that hold the continents and the oceans.*
➤ The lithosphere includes the rigid crust and the topmost part of the mantle — it’s broken into tectonic plates.

2. outer core →
*The only liquid layer of the earth, this layer is made up mostly of iron and nickel. It is located about 2000 miles below the surface.*
➤ This molten layer generates Earth’s magnetic field through convection currents.

3. crust →
*The earth’s outermost and thinnest layer, hard and rigid, and only a few miles thick under the oceans and averaging 20 miles thick under the continents.*
➤ This is the layer we live on — oceanic crust is thinner than continental crust.

4. mantle →
*A dense layer subdivided into upper and lower regions made of hot, semisolid rock located directly below the crust and about 1,800 miles thick.*
➤ The mantle is mostly solid but flows very slowly over geologic time; it drives plate tectonics.

5. asthenosphere →
*Hot, malleable semiliquid in the upper mantle on which the plates of the lithosphere float.*
➤ This is the “squishy” part of the upper mantle that allows tectonic plates to move.

6. inner core →
*The innermost layer, extremely hot and solid, composed of mostly iron and nickel.*
➤ Despite extreme heat, pressure keeps it solid — it’s like a giant metal ball at Earth’s center.

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🌍 Labeling the Layers in the Diagram (from outside to inside)

Looking at the cross-section diagram of Earth:

- Top arrow (pointing to the very outer thin layer) → Crust
➤ This is the outermost shell — you can see landmasses and oceans on its surface.

- Second arrow (pointing to the thick middle layer) → Mantle
➤ The largest layer by volume, between the crust and the core.

- Third arrow (pointing to the liquid outer ring around the center) → Outer Core
➤ This is the molten layer surrounding the inner core.

- Bottom arrow (pointing to the solid center) → Inner Core
➤ The hottest, densest, and innermost part of Earth.

> ⚠️ Note: The lithosphere and asthenosphere are not typically labeled as separate layers in simple diagrams like this one — they are subdivisions *within* the crust and upper mantle. In this diagram, you’re expected to label the 4 main structural layers: Crust, Mantle, Outer Core, Inner Core.

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✔ Final Answer Summary:

Matching:
- lithosphere → definition #4
- outer core → definition #6
- crust → definition #2
- mantle → definition #5
- asthenosphere → definition #3
- inner core → definition #1

Diagram Labels (top to bottom):
1. Crust
2. Mantle
3. Outer Core
4. Inner Core

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This activity helps students understand Earth’s structure both conceptually (through definitions) and visually (through labeling). The key takeaway: Earth has layers with different physical states (solid, liquid, plastic) and compositions, each playing a vital role in planetary processes like plate tectonics and magnetism.