Instructions
Read the passage below about the layers of our planet. Use the information to complete the activities that follow. Good luck, Earth Explorer!
Part 1: Reading Comprehension - Our Planet from the Inside Out
Imagine the Earth is like a giant onion with several different layers. If you could travel to the very center, you would pass through four main zones: the crust, the mantle, the outer core, and the inner core. Each layer is made of different materials and has unique characteristics.
The Crust is the thinnest, outermost layer. It's the rocky surface we live on, including the continents and the ocean floor. It's broken into huge pieces called tectonic plates, which are always moving very, very slowly.
Below the crust is the Mantle. This is the thickest layer of the Earth, making up about 84% of our planet's volume. It's made of hot, dense, semi-solid rock that flows like extremely thick honey. This slow movement in the mantle is what causes the tectonic plates on the crust to shift, leading to earthquakes and volcanoes.
Deeper still is the Outer Core. This layer is made of liquid iron and nickel and is incredibly hot. The constant swirling and movement of this liquid metal creates Earth's magnetic field, which acts like an invisible shield protecting us from harmful solar wind.
Finally, at the very center, is the Inner Core. It's a solid ball of iron and nickel, and it's the hottest part of our planet—as hot as the surface of the sun! You might wonder why it's solid if it's so hot. It's because the immense pressure from all the other layers pushing down on it is so strong that it forces the atoms to squeeze together and become solid.
Part 2: Vocabulary Match-Up
Draw a line to match the vocabulary word from the reading with its correct definition.
| 1. Crust | A. The thickest layer made of hot, semi-solid rock. |
| 2. Mantle | B. The liquid layer of iron and nickel that creates the magnetic field. |
| 3. Outer Core | C. The thin, rocky outer layer of the Earth where we live. |
| 4. Inner Core | D. Huge, moving pieces that make up the Earth's surface. |
| 5. Tectonic Plates | E. The solid, super-hot ball of iron and nickel at the very center. |
Part 3: Label the Earth
Use the words from the Word Bank to label the four main layers of the Earth in the blanks provided.
____(A)______
/ \
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/ ____(B)_____ \\
/ / \\ \\
| | --(C)-- | |
| | ( _(D)_ ) | |
\\ \\ / /
\\ ------------- /
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A. _________________________
B. _________________________
C. _________________________
D. _________________________
Part 4: Creative Writing - A Journey Inside
Imagine you are an explorer in a special vehicle that can travel through the Earth. You have just passed through the rocky crust and are now entering the Mantle. Write a short journal entry (3-5 sentences) describing your experience. Think about what you would see, feel, and hear. Use descriptive words!
Journal Entry: Mission Log 7
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Answer Key
Part 2: Vocabulary Match-Up
- Crust → C. The thin, rocky outer layer of the Earth where we live.
- Mantle → A. The thickest layer made of hot, semi-solid rock.
- Outer Core → B. The liquid layer of iron and nickel that creates the magnetic field.
- Inner Core → E. The solid, super-hot ball of iron and nickel at the very center.
- Tectonic Plates → D. Huge, moving pieces that make up the Earth's surface.
Part 3: Label the Earth
A. Crust
B. Mantle
C. Outer Core
D. Inner Core
Part 4: Creative Writing - A Journey Inside
Answers will vary. A good answer should mention the heat and the thick, slowly moving, glowing rock of the mantle. Example answer:
"We've made it through the crust! Outside my window, everything is glowing a deep red and orange. The rock isn't solid here; it moves slowly like a giant, fiery river of sludge. My ship is shaking a little as we push through the thick material, and the temperature gauge is rising fast. It feels like we are swimming through the center of a volcano!"