A rock formed from the bits and pieces of other rocks is a(n):

Question

BlackTom AI · Accepted Answer

Sedimentary rocks form from the accumulation and lithification of fragments, minerals, and organic material, so the correct answer is sedimentary rock.

1. Relevant knowledge points and concepts
- Rock types: igneous (formed by cooling of magma/lava), metamorphic (formed by heat and pressure altering existing rocks), and sedimentary (formed from sediment).
- Sediment sources: weathering and erosion produce bits and pieces (clasts) of preexisting rocks and minerals.
- Processes: deposition, compaction, and cementation (lithification) turn loose sediment into solid sedimentary rock.
- Subtypes: clastic sedimentary rocks (made of rock fragments, e.g., conglomerate, sandstone, shale), chemical sedimentary rocks (precipitated minerals, e.g., limestone), and organic sedimentary rocks (accumulated biological material, e.g., coal).

2. Step-by-step reasoning
- The phrase “bits and pieces of other rocks” describes fragments produced by weathering and erosion.
- These fragments are transported (by water, wind, ice) and deposited in layers.
- Over time, layers are buried, compacted, and cemented into rock.
- This sequence (sediment → burial → compaction/cementation → rock) defines formation of sedimentary rock, specifically clastic sedimentary rock.

3. Calculations or intermediate steps
- No numerical calculations are required for this conceptual classification question.

4. Why the correct answer is correct
- Because sedimentary rocks literally form from sediments—bits and pieces of other rocks—lithified into new rock. Clastic sedimentary examples (conglomerate from rounded pebbles, sandstone from sand-sized grains) directly match the description.

5. Why other options are incorrect
- Igneous rocks originate from cooled magma or lava, not fragments of other rocks.
- Metamorphic rocks form when existing rocks are transformed by heat and pressure without melting; they are not composed of loose bits glued together.

6. Conclusion
The best and correct classification for a rock made from bits and pieces of other rocks is sedimentary rock, which matches the provided answer: sedimentary rock.

A rock formed from the bits and pieces of other rocks is a(n):单项选择题

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