Which geological process can change any rock into sedimentary rock?

Question

BlackTom AI · Accepted Answer

Weathering and erosion break down existing rock into smaller particles and dissolved materials that can be transported, deposited, and eventually turned into sedimentary rock.

1) Relevant concepts
- Rock cycle: the processes that transform rocks among igneous, sedimentary, and metamorphic types.
- Weathering: physical (mechanical) and chemical breakdown of rocks at Earth’s surface into clasts (grains) and dissolved ions.
- Erosion and transport: movement of weathered material by water, wind, ice, or gravity.
- Deposition and lithification: settling of sediment followed by compaction and cementation to form sedimentary rock (e.g., sandstone, shale, limestone).

2) Step-by-step reasoning
Step 1: Any rock (igneous, metamorphic, or existing sedimentary) exposed at the surface undergoes weathering: freeze–thaw fractures, abrasion, root growth, or chemical dissolution.
Step 2: Erosion removes the weathered particles and dissolved material and transports them to a basin (river, delta, ocean).
Step 3: Sediment is deposited when the transporting medium loses energy.
Step 4: Over time burial causes compaction; minerals precipitate and cement the particles together (cementation), completing lithification into sedimentary rock.

3) Intermediate steps
- Example: Granite (igneous) experiences chemical weathering → quartz and clay grains freed → rivers carry grains to a basin → layers settle → pressure compacts layers → silica or calcite cements grains → sandstone or shale forms.

4) Why the correct answer is correct
Weathering and erosion are the essential initial and transport processes that produce the loose sediments and dissolved ions required for sedimentary-rock formation. Without breaking down and moving material, sedimentary rocks cannot form.

5) Why other options are incorrect
- Cooling: solidifies magma or lava to form igneous rock, not sedimentary rock.
- Melting: produces magma; after cooling it yields igneous rock.
- Heat and pressure: metamorphism alters rock mineralogy/texture to form metamorphic rock, not sedimentary.

6) Conclusion
Therefore, the correct process that can change any rock into sedimentary rock is Weathering and erosion, which matches the provided answer.

Which geological process can change any rock into sedimentary rock?单项选择题

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