Earth's Layers Quiz 6th Grade

1. What are the three distinctive layers of the mantle?

• A. Oceanic Crust, Continental Crust, Volcanic Crust

• B. Lithosphere, Asthenosphere, Mesosphere

• C. Upper mantle, Middle mantle, Lower mantle

• D. Crust, Mantle, Core

Which of the Earth's layers is the hottest and densest?

• A. Inner Core

• B. Outer Core

• C. Mantle

• D. Crust (Oceanic + Continental)

Which layer of the Earth is the thickest?

• A. Inner Core

• B. Outer Core

• C. Mantle

• D. Crust (Oceanic + Continental)

4. What do convection currents do?

• A. They create magma in the mantle.

• B. They help all the layers maintain their shape.

• C. They keep the core warm.

• D. They cause tectonic plates to converge.

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5. Why does the Oceanic Crust sink underneath the Continental crust?

• A. Convection currents pull the oceanic crust down further than the continental crust.

• B. The Oceanic crust is made of basalt, which makes it denser than the Continental Crust.

• C. The weight of the water (and other masses in the ocean) causes it to sink.

• D. None of the Above

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6. What causes tectonic plates to move?

• A. Convection currents create pressure that moves tectonic plates.

• B. Wind, water, and other forces move tectonic plates.

• C. The plastic (liquid + solid) mantle is the main cause of the movement of plate tectonics.

• D. They don't move.

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7. Kevin made a report on the Earth's crust and mantle. "Crust: Thinnest and Hottest Layer. Mantle: Solid layer with three distinctive layers." What was his mistake? (Hint: There are multiple answers!)

• A. The mantle has 4 distinctive layers, not three.

• B. The crust is not the hottest layer of the Earth.

• C. The mantle is plastic (solid+liquid), not solid.

• D. There is no mistake.

8. How does a convergent plate boundary recycle old crust?

• A. Oceanic crust is often forced down and melts into new crust.

• B. Convection currents pull down the crust where it is turned to dust and recycled as new crust.

• C. It cannot recycle old crust.

• D. None of the Above

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9. Which boundary causes rift valleys?

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10. Look at the image below. Using the image, how can you explain the Earth's layers to someone? (Hint: There are multiple answers)

• A. You can explain that the Earth is made up of 4 layers, each having distinctive characteristics.

• B. You can explain that the Lithosphere and Asthenosphere are the two main layers of the Earth.

• C. You can explain that the Earth is made up of the Crust, Mantle, Outer Core, and Inner Core.

• D. You can explain that water caused the formation of Earth's 7 layers.

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