Answer :
Final answer:
Clastic sedimentary rocks are formed from the compaction of other rock fragments. Among the given options, the third option contains only clastic sedimentary rocks which are shale, sandstone, conglomerate, and breccia. Therefore, that option is the correct choice.
Explanation:
Identifying Clastic Sedimentary Rocks
To determine which option contains only clastic sedimentary rocks, we first need to know what clastic sedimentary rocks are. These are rocks formed from the compaction and cementation of particles called clasts, which can be fragments of other rocks or minerals.
Here are the options provided:
- Shale, limestone, sandstone, coal: Here, limestone and coal are not clastic. Limestone is a chemical sedimentary rock, and coal is organic.
- Coal, rock salt, chert, limestone: Again, coal and rock salt do not qualify as clastic sedimentary rocks, as coal is organic and rock salt is a chemical sedimentary rock.
- Shale, sandstone, conglomerate, breccia: All these are indeed clastic sedimentary rocks. Shale forms from compacted clay, sandstone from cemented sand grains, conglomerate from rounded pebbles, and breccia from angular clasts.
- Chert, coal, shale, limestone: Here, coal and limestone again do not qualify as clastic, making this option incorrect.
Based on the analysis, the correct answer that only contains clastic sedimentary rocks is the third option: shale, sandstone, conglomerate, breccia.
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