Activity 5.2 - Convergent Boundaries: Two cross-section diagrams demonstrating subduction and collision processes with labels for oceanic and continental crust, mantle, volcanoes, and mountain ranges.

Let's solve this step-by-step by analyzing both diagrams and using the provided word banks to correctly label the features in each cross-section.

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Activity 5.2 – Convergent Boundaries

This activity focuses on two types of convergent plate boundaries:
1. Convergent Subduction (oceanic-continental convergence)
2. Convergent Collision (continental-continental convergence)

We'll label each diagram using the appropriate terms from the word banks.

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## 🔹 Diagram 1: Convergent Subduction

This shows an oceanic plate subducting beneath a continental plate.

Word Bank:

- Ocean
- Volcano
- Oceanic crust
- Continental crust
- Trench
- Subduction
- More dense rock
- Less dense rock
- Mantle

Step-by-step labeling:

1. Top left (blue area) → This is the Ocean.
- Label: Ocean

2. Arrow pointing into the ocean → This is where the oceanic crust is being pushed down.
- Label: Oceanic crust

3. The deep depression at the edge of the ocean → This is a Trench, formed as the oceanic plate bends downward.
- Label: Trench

4. The gray layer under the ocean → This is the Oceanic crust.
- Label: Oceanic crust

5. The brown landmass → This is the Continental crust.
- Label: Continental crust

6. The red magma rising upward → This forms a Volcano.
- Label: Volcano

7. The process shown by the arrow going downward → This is Subduction.
- Label: Subduction

8. The darker, denser layer being pushed down → This is More dense rock (oceanic crust).
- Label: More dense rock

9. The lighter-colored layer above it → This is Less dense rock (continental crust).
- Label: Less dense rock

10. The orange layer below the crusts → This is the Mantle.
- Label: Mantle

✔ Final labels for Convergent Subduction:
- Top left: Ocean
- Arrow pointing into water: Oceanic crust
- Deep groove: Trench
- Underwater layer: Oceanic crust
- Landmass: Continental crust
- Magma erupting: Volcano
- Downward movement: Subduction
- Descending slab: More dense rock
- Upper crust: Less dense rock
- Bottom layer: Mantle

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## 🔹 Diagram 2: Convergent Collision

This shows two continental plates colliding, forming mountains.

Word Bank:

- Collision
- Continental crust
- Mountain range
- Mantle
- Old Oceanic Crust

Step-by-step labeling:

1. The mountain peaks → These are formed by the collision and uplift → Mountain range
- Label: Mountain range

2. The arrows showing the plates moving toward each other → This is the Collision process.
- Label: Collision

3. The thick, green layers under the continents → These are Continental crust.
- Label: Continental crust

4. The folded layers beneath the continental crust → These are remnants of Old Oceanic Crust that were subducted and now lie beneath.
- Label: Old Oceanic Crust

5. The orange layer at the bottom → This is the Mantle.
- Label: Mantle

✔ Final labels for Convergent Collision:
- Mountains: Mountain range
- Arrows showing movement: Collision
- Thick upper layers: Continental crust
- Beneath the crust (folded): Old Oceanic Crust
- Bottom layer: Mantle

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✔ Final Answer Summary:

#### Convergent Subduction Diagram:
- Ocean
- Oceanic crust (arrow pointing in)
- Trench
- Oceanic crust (underwater)
- Continental crust
- Volcano
- Subduction (downward arrow)
- More dense rock (descending slab)
- Less dense rock (continental crust)
- Mantle

#### Convergent Collision Diagram:
- Mountain range
- Collision (arrows)
- Continental crust
- Old Oceanic Crust
- Mantle

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🌍 Explanation:

- Convergent Subduction: Occurs when an oceanic plate collides with a continental plate. The denser oceanic crust sinks (subducts) beneath the less dense continental crust, forming a trench and causing volcanoes due to melting in the mantle.

- Convergent Collision: Happens when two continental plates collide. Neither plate subducts because they are too buoyant. Instead, they crumple and fold, forming mountain ranges like the Himalayas. The old oceanic crust between them may be buried or recycled.

These processes are key parts of plate tectonics and explain how Earth’s surface features are shaped over millions of years.

Let me know if you'd like a labeled version or printable answer sheet!