Enlarged view

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	This picture shows a handful of material from the edge of a river. The pebbles are on one side and the sand is on the other. Clay is so small, most of it washes away as you take a sample from the river's edge.

This picture shows a handful of material from the edge of a river. The pebbles are on one side and the sand is on the other. Clay is so small, most of it washes away as you take a sample from the river's edge.