Which more nearly describes the modern view of geology?

Question

BlackTom AI · Accepted Answer

Plate tectonics states that the Earth's lithosphere (the rigid crust plus uppermost mantle) is divided into a few major plates and several smaller ones, and most major mountain-building (orogeny) happens at plate boundaries where plates converge.

1) Relevant concepts:
- Lithosphere vs. mantle: the lithosphere is the rigid outer shell; the underlying asthenosphere and deeper mantle flow and convect but are not rigid plates.  
- Plate boundaries: convergent boundaries (collision or subduction), divergent boundaries (rifting, mid-ocean ridges), and transform faults.  
- Orogeny: large mountain belts form primarily at convergent plate margins (continental collision or oceanic-continental subduction).

2) Step-by-step reasoning:
- Observations: major mountain ranges (Himalayas, Andes, Alps) align with plate boundaries. The Himalayas are produced by India-Eurasia continental collision; the Andes by Nazca plate subducting beneath South America.  
- Plate count: plate-tectonic theory identifies a few major plates (Pacific, North American, Eurasian, African, Antarctic, Australian, South American) plus several smaller plates. This is “a few major plates,” not “several dozen small plates” as the dominant description.  
- Mechanism: mountain building requires large-scale compression and crustal shortening or uplift, which occurs where plates interact at edges. Intraplate centers (cratons) are relatively stable and do not produce most mountain belts.

3) No numerical calculations are required here.

4) Why the correct choice is correct:
- It matches observational and theoretical evidence: lithosphere broken into a few major plates, and convergent margins at plate edges are the sites of most mountain-building processes.

5) Why other options are incorrect:
- “...near their centers”: interior of plates are generally tectonically stable, so this is false.  
- “Several dozen small plates, and ... caused by hot spots”: hot spots create localized volcanic islands (Hawaii), not the majority of mountain belts.  
- “...caused by meteorite impacts”: impacts are rare and do not account for the global distribution of mountain ranges.  
- “The Earth’s mantle is broken into a few major plates...”: the mantle convects but is not a set of rigid plates—the lithosphere is.

Conclusion: The correct answer is: "The Earth’s lithosphere is broken into a few major plates, and most mountain building occurs near their edges." This matches the provided answer.

Which more nearly describes the modern view of geology? 单项选择题

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