Question

Greg wrote the following steps in the formation of sedimentary rocks.

Step 1: Weathering of rocks forms sediments
Step 2: Sediments are heated
Step 3: Sediments are deposited
Step 4: Compaction and cementation forms rocks

Which step is incorrect?

Answer 1

Sedimentary rocks do not undergo heating it’s metamorphic rocks that do.

Answer 2

Option (2)

Step-by-step explanation:

Sedimentary rocks are those rocks that are formed when sediments undergo compaction and lithification process. For an example of sedimentary rocks are shale, sandstone, limestone, and mudstone.

Initially, the rocks are subjected to weathering due to the various factors under certain climatic conditions. The weathered particles (sediments) are then carried by the agents such as wind, water, and ice and are transported to some other place. These sediments are then deposited and after undergoing significant compaction and cementation, it forms sedimentary rocks. This is the steps involved in the formation of sedimentary rock.

Temperature is not related to the sedimentary rock formation. If it is subjected to temperature and pressure changes, then it will lead to the formation of metamorphic rock.

Thus, step 2 is not correct.

Hence, the correct answer is option (2).