2018 · Q14
Statement IPortions of glacial troughs may exhibit remarkably flat floors.
Statement IIThe flat floor in a glacial trough is produced by uniform glacial erosion.
General KnowledgeGeography
- ABoth the statements are individually true and Statement II is the correct explanation of Statement I
- BBoth the statements are individually true but Statement II is not the correct explanation of Statement I
- CStatement I is true but Statement II is false
- DStatement I is false but Statement II is true
Explanation
Glacial troughs are U-shaped valleys with steep sides and remarkably flat, broad floors, so Statement I is true. The glacier's great mass scours the valley floor broadly and evenly through abrasion and plucking, levelling irregularities, so Statement II is true. This even scouring action is what produces the flat floor, making Statement II the correct explanation of Statement I.