Which one of the following sedimentary rocks has <strong>NOT</strong> been formed mechanically?
- A. Sandstone
- B. Conglomerate
- C. Loess
- D. Geyserites ✓
Correct Answer: D. Geyserites
Explanation
Geyserites are a form of opaline silica that precipitates chemically from the hot water of geysers and hot springs, making them chemically formed sedimentary rocks, unlike mechanically formed sandstone, conglomerate, and loess.
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