During a torrential rainstorm in a highland terrain, saturated soil and loose rock debris rapidly slide down a steep slope under the direct force of gravity. Which environmental hazard is illustrated by this event, and how does it fundamentally differ from weathering?
- Landslide; it involves the downslope movement of slope materials under gravity, whereas weathering is the in-situ disintegration of rocks without displacement.Cevap
- BMass wasting; it involves the chemical alteration of minerals by acid rain, whereas weathering is the gravitational displacement of soil down river valleys.
- CGully erosion; it involves the in-situ mechanical fracturing of bedrock, whereas weathering is the rapid movement of regolith along hillslopes.
- DSheet wash; it involves the uniform removal of surface topsoil by overland flow, whereas weathering is the sudden failure of slopes due to tectonic stress.
Cevap
The hazard is a landslide, which is a form of mass wasting involving the downslope movement of rock and soil debris under gravity, whereas weathering refers strictly to the in-situ physical breakdown or chemical decomposition of rocks without transportation.
The correct response identifies the hazard as a landslide (a form of mass wasting) and correctly states that mass movement involves gravitational transport down a slope, whereas weathering is an in-situ process of decay and disintegration without transportation of the weathered materials.
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Anahtar Kavram
Distinction between mass wasting hazards and weathering processes