What type of boundary is shown in the diagram below?

Question

BlackTom AI · Accepted Answer

The correct answer is Oceanic - Continental Convergent because the diagram shows an oceanic plate being forced beneath a continental plate (subduction), producing a trench and a volcanic mountain chain on the continent.

1. Relevant knowledge points and concepts
- Plate boundaries: convergent (plates collide), divergent (plates move apart), transform (slide past).
- Subduction: at convergent boundaries where an oceanic plate meets continental crust, the denser oceanic lithosphere sinks beneath the lighter continental lithosphere.
- Typical features of oceanic–continental convergence: a deep ocean trench at the subduction zone, an inland volcanic arc (volcanoes and mountain ranges), and seismic activity along the descending slab.

2. Step-by-step reasoning
- The block diagram labels the Pacific Plate (oceanic) on the right and shows an oceanic lithosphere edge descending beneath a thicker continental block on the left.
- Arrows indicate the oceanic plate moving toward and under the continental plate (convergence and subduction).
- A trench (Hikurangi Trench) is present at the plate boundary—classic for subduction zones.
- Volcanic features (White Island, Mt. Ruapehu) are shown on the continental side inland of the trench, indicating melting above the subducting slab and formation of a continental volcanic arc.

3. Calculations/intermediate steps
- No numeric calculations apply; the deduction is based on labeled features and plate motion arrows.

4. Why this answer is correct
- The combination of a trench, subducting oceanic lithosphere, and a continental volcanic arc matches the textbook model of an oceanic–continental convergent boundary.

5. Why the other options are incorrect
- Oceanic–Continental – Divergent: divergent boundaries show mid-ocean ridges and seafloor spreading, not trenches or subduction.
- Oceanic–Oceanic – Divergent: this would show seafloor spreading between two oceanic plates, not a trench plus continental volcanism.
- Oceanic–Oceanic Convergent: produces an island arc of volcanoes on oceanic crust (volcanic islands), not a continental volcanic chain like Mt. Ruapehu.

6. Conclusion
All diagram features (Hikurangi Trench, subducting Pacific Plate, continental volcanoes) confirm an Oceanic - Continental Convergent boundary, matching the provided answer.

What type of boundary is shown in the diagram below?单项选择题

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