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A BRIEF DISCUSSION OF SEDIMENT
Obtain a large test tube that can be corked. Mix at least three sizes of gravel, some sand, and mud together. Place the mixture in the tube, and fill it with water. Cork and invert the tube.
You will see that as the materials fall through the water, the larger materials settle quickly at the bottom, medium sizes settle in the middle, and fine silt settles slowly at the top.
Rivers, streams, and oceans carry sediments and deposit them on the basis of weight and size.
you can find out directly:
Examine the grains with a hand lens or binocular microscope (if one is available) and identify and classify the differences in types of grains making up each sample.
work out the percentage of each kind and hypothesize where the various
grains came from. If possible, return to the seashore at later date, and
collect samples from the same locations. Compare these samples with the
previous ones to see if there are any changes.
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