Which type of boundary does letter B represent?

Question

BlackTom AI · Accepted Answer

Divergent plate boundaries occur where two tectonic plates move away from each other and magma rises to fill the gap, creating new crust (mid‑ocean ridges and rift valleys).

1) Relevant knowledge points and concepts
- Divergent boundary: plates move apart; upwelling magma produces new oceanic crust, mid‑ocean ridges, volcanic activity along a spreading center, and symmetric seafloor spreading.
- Convergent boundary: plates move toward each other; subduction, trenches, volcanic arcs, mountain building.
- Transform boundary: plates slide laterally past one another; strike‑slip faults, earthquakes but little or no volcanic upwelling.
- Biosphere: not a tectonic plate boundary term.

2) Step‑by‑step reasoning using the diagram
- Observe letter B in the figure: it marks a location where molten material (red/orange upwelling) is rising between two plates.
- White arrows on either side of the upwelling indicate plates moving away from the center (opposite directions).
- Features shown (magma upwelling, newly forming seafloor, and arrows pointing outward) match the classic mid‑ocean ridge/spreading center.

3) Calculations / intermediate steps
- No numerical calculations are needed; identification rests on interpreting the directional arrows and presence of magma at the ridge.

4) Why the correct answer is correct
- Because B marks a spreading center with magma ascent and plates diverging, it is correctly identified as a divergent boundary. New crust is created as the plates separate, which is exactly what the image illustrates at B.

5) Why other options are incorrect
- Convergent: would show one plate subducting beneath another, trenches, and volcanic arcs—absent at B.
- Transform: would show horizontal sliding with no central magma upwelling—also absent.
- Biosphere: unrelated to plate boundary types.

6) Conclusion
- The best choice is Divergent, which matches the provided correct answer.

Which type of boundary does letter B represent?多项选择题

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