Sediments and Sorting

Sediments and Sorting
Introduction I have been set a piece of coursework. This investigation is about workout the environment by studying sediments. I will look at the sorting of the grain sizes of the sediment to work out what the environment will look like. Sorting is the number of different sized particles within sediment. I already know that if there is a wide range of grain size that the sediment is poorly sorted and that this tells me that the flow was suddenly stopped. This is like a river flowing it a lake. The stationary water in the lake suddenly stops the flow. I also know that if the grains are all of mainly one size that it is well sorted and this tells me that the flow was constant. This is like when a river is flowing down the mountain; the single grain size is dropped due to it cannot hold it (to heavy). Aim My Aim is to find how well sorted the sediments are and state what their environment must have been like. Apparatus This is a list of apparatus that, I think will produce the most fair and accurate results: ? Sieve tower ? Electronic scales ? Five different sediment samples
? Two 250 ml Beakers Method First draw a table which has nine columns and six rows. The table should look like this: Sample Starting Mass
>2mm

>1mm

>0.5mm

>0.25mm

>0.125mm

>0.067mm

2mm

>1mm

>0.5mm

>0.25mm

>0.125mm

>0.067mm

2mm bar has the majority (89.4 grams) of the mass. This tells me that this sediment is from further up in the river and that the pieces where very large, not needing many pieces to add up the weight. I have noticed that for samples 2, 3 and 4 the majority of the weight is collected in the>0.25mm sieve. This tell me that they where dropped in similar scenarios (in the middle stage of the river where erosion and deposition take place). You may notice this on the bar charts (graphs). Evaluation I think that I have done a fairly accurate test but I could of repeated the times I did each sample to three or may be five this would produce a more fair and accurate test. This would also improve the reliability of the investigation. I could of listed and explained the environments where the sediment is located in a table or something. I could have also looked into the mineral content of the sediment to improve my prediction of the type of the sediment environment.

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