Sediment
 Sediment is the word geologists use for loose pieces of minerals
and rock. Of course, pieces of rock come in all sizes so we have developed
a way to classify them. The chart on the left shows we use for each grain
size. Most of the names are ones you already use; sand, boulders, and clay,
for example. The illustrations of sand and pebbles are shown at their actual
sizes. Unfortunately silt and clay are smaller than a single pixel on your
computer screen, so they don't show up well here! Cobbles and boulders are
another problem - they are too big to fit on your screen!
Metric system chart
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