Making Observations Clastic sedimentary rocks are formed during a process called
ID: 288075 • Letter: M
Question
Making Observations
Clastic sedimentary rocks are formed during a process called diagenesis. The process of diagenesis is similar for many sedimentary rock types. Here is the process described specially for the diagenesis of sand into sandstone.
Imagine a large deposit of loose sand sediment along a shoreline.
Over a great amount of time, the sand is compacted as more and more sand is piled on top.
Greater depths increase heat and pressure, which cause the sand to cement together, and become sandstone.
Over time, the material above the sandstone will be eroded, as will the sandstone. Sedimentary rocks that have clasts prone to falling off are said to be poorly cemented, while rocks with clasts firmly in place are well cemented.
Sort the statements describing the clasts shown.
Reset Help The clasts within this rock are younger than the rock itself. The clasts of this rock are well cemented The clasts within this rock are older than the rock itself. from the same rock type The clasts within this rock show signs of abrasion. Statement describes the rock shown in this Gigapan Statement does NOT describe the rock shown in this GigapanExplanation / Answer
STATEMENT DESCRIBES:
1.Clasts with in these rock are all from the same rock type. as these sediments are from shoreline these are well sorted and will be quartz grains.
2.clasts with in these rocks are older than the rock itself. As sedimentary rock is formed after the deposition of preexisting sediments it is younger than the sediments.
3.the clasts of this rock are well cemented as the grains are well sorted.
STATEMENT NOT DESCRIBES:
4.The clasts with in these rocks are younger than the rock itself.(explained in point 2).
5. the clasts with in the rock shows sign of abrasion. as the grains are well sorted abrasion marks cannot be observed.
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