Ocean Floor Spreading Process Diagram

It looks like you've uploaded a text-based image of a reading passage titled "Ocean Floor Spreading", but there is no specific question or task visible in the image. The passage explains the process of seafloor spreading, which is a key concept in plate tectonics.

Here's a summary and explanation of the content, along with potential questions that might accompany this passage:

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🔍 Summary of the Passage:

The passage describes how scientists have discovered mid-ocean ridges—underwater mountain ranges formed by the movement of tectonic plates. At these ridges:

- Magma rises from beneath the Earth’s crust through cracks.
- This magma cools and solidifies, forming new oceanic crust.
- The new crust pushes older crust outward on both sides of the ridge, causing the ocean floor to "spread."
- This process is called seafloor spreading.
- Over time, the old oceanic crust gets pushed toward the edges of the plates, where it sinks back into the mantle at subduction zones (e.g., deep ocean trenches).
- This cycle continuously renews the ocean floor.

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🧠 Key Concepts Explained:

1. Mid-Ocean Ridges: Underwater mountain chains where new oceanic crust forms.
2. Rift Valley: A deep crack in the mid-ocean ridge where magma rises.
3. Seafloor Spreading: The process where new crust forms and pushes older crust away from the ridge.
4. Subduction: The process where old oceanic crust sinks back into the mantle at convergent boundaries.
5. Conveyor Belt Analogy: The ocean floor moves like a conveyor belt—new material added at the ridge, old material recycled at trenches.

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✔ Possible Questions & Answers (Commonly Asked):

#### Q1: What causes seafloor spreading?
A: Seafloor spreading is caused by magma rising up through cracks at mid-ocean ridges. As the magma cools and hardens, it forms new oceanic crust, pushing the existing crust apart.

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#### Q2: Why doesn't the Earth get larger despite new crust forming at mid-ocean ridges?
A: Because while new crust is created at mid-ocean ridges, an equal amount of old crust is destroyed at subduction zones, where it sinks back into the mantle. This balance keeps the Earth’s size constant.

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#### Q3: What happens to the oceanic crust as it moves away from the mid-ocean ridge?
A: As the crust moves away from the ridge, it cools, becomes denser, and eventually reaches a subduction zone, where it sinks back into the mantle.

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#### Q4: How does the ocean floor resemble a conveyor belt?
A: New crust is added at the mid-ocean ridge (like the start of a conveyor belt), and old crust is removed at subduction zones (like the end of the belt), creating a continuous cycle.

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