Crust is neither destroyed nor formed along which boundaries?

Question

BlackTom AI · Accepted Answer

At transform boundaries, crust is neither created nor destroyed: tectonic plates slide horizontally past one another.

1. Relevant knowledge points and concepts
- Plate boundaries come in three main types: divergent (plates move apart), convergent (plates move together), and transform (plates slide past each other).
- Divergent boundaries produce new crust by upwelling magma (seafloor spreading).
- Convergent boundaries often destroy crust via subduction or cause crustal thickening through collision.
- Transform boundaries are sometimes called conservative margins because they conserve existing crustal area.
- "Convection" is a mantle process driving plate motion, not a plate-boundary type.

2. Step-by-step reasoning
- Ask what happens to crust at each boundary type.
- Divergent: upwelling magma fills the gap and solidifies → new crust is formed.
- Convergent: one plate is forced down (subducted) or crust is shortened → crust is destroyed or reworked.
- Transform: plates move laterally with no significant addition or removal of crust → crust neither formed nor destroyed.
- Therefore, the boundary type that conserves crustal material is transform.

3. Calculations/intermediate steps
- No numerical calculations are required; the reasoning is conceptual and comparative across boundary types.

4. Why the correct answer is correct
- Transform (conservative) boundaries involve horizontal slip; there is no mechanism for magma emplacement to create new crust, nor for subduction to remove crust. Hence crustal mass remains essentially unchanged overall.

5. Why the other options are incorrect
- Convergent: incorrect because subduction zones recycle crust back into the mantle, destroying crust.
- Divergent: incorrect because seafloor spreading generates new crust at mid-ocean ridges.
- Convection: incorrect because it is a driving mechanism in the mantle, not a plate boundary; it does not describe a boundary where crust is conserved.

6. Conclusion
- The correct answer is Transform, which matches the provided answer.

Crust is neither destroyed nor formed along which boundaries?单项选择题

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