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The alluvial diamonds found in the gravel beds of coastal Namibia were
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05 Jul 2026, 05:36
05 Jul 2026, 05:36
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Question Stats:
16% (01:26) correct
83% (01:28) wrong based on 18 sessions
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The alluvial diamonds found in the gravel beds of coastal Namibia were originally (i) ________ the kimberlite pipes of the continental interior, carried hundreds of kilometers by ancient rivers before coming to rest in their present marine sediments. The gem-quality stones now extracted from those same pipes, however, represent a very different category: material that (ii) ________ its geologic origin, having been mined directly from the volcanic matrix in which it crystallized.
| Blank (i) | Blank (ii) |
|---|---|
| A. formed within | D. is extracted beyond |
| B. eroded from | E. remains at |
| C. transported from | F. strays far beyond |
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Re: The alluvial diamonds found in the gravel beds of coastal Namibia were
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06 Jul 2026, 04:00
06 Jul 2026, 04:00
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The correct answers are B. eroded from and E. remains at.
Explanation
- Blank (i): The sentence tells us that the alluvial diamonds were found in "gravel beds" and were "carried hundreds of kilometers by ancient rivers." For rivers to carry these diamonds out of the "kimberlite pipes of the continental interior," the diamonds must have first been broken down or worn away from their source. Eroded from perfectly captures this geological process of wearing away and transport. While transported from is factually true, eroded from is the logically and geologically precise step that allowed them to enter the river system in the first place.
- Blank (ii): The sentence sets up a sharp contrast using "however" and "represent a very different category." Unlike the alluvial diamonds that traveled hundreds of kilometers away, these gem-quality stones are "mined directly from the volcanic matrix in which it crystallized." Therefore, this material remains at its geologic origin.
Difficulty Level
Medium-High. This question tests both scientific reading comprehension and the ability to track a clear geographic/geologic contrast between material that traveled far away versus material that stayed in place.
Explanation
- Blank (i): The sentence tells us that the alluvial diamonds were found in "gravel beds" and were "carried hundreds of kilometers by ancient rivers." For rivers to carry these diamonds out of the "kimberlite pipes of the continental interior," the diamonds must have first been broken down or worn away from their source. Eroded from perfectly captures this geological process of wearing away and transport. While transported from is factually true, eroded from is the logically and geologically precise step that allowed them to enter the river system in the first place.
- Blank (ii): The sentence sets up a sharp contrast using "however" and "represent a very different category." Unlike the alluvial diamonds that traveled hundreds of kilometers away, these gem-quality stones are "mined directly from the volcanic matrix in which it crystallized." Therefore, this material remains at its geologic origin.
Difficulty Level
Medium-High. This question tests both scientific reading comprehension and the ability to track a clear geographic/geologic contrast between material that traveled far away versus material that stayed in place.
gmatclubot
Re: The alluvial diamonds found in the gravel beds of coastal Namibia were [#permalink]
06 Jul 2026, 04:00
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