Streams and rivers are wonderful places to find a variety of rocks. By looking at the gravel in a stream, you can see bits of rock from many of the different layers that the water cut through. This can be very useful if you are looking for a specific layer of rock. Imagine that you are exploring a stream, and you find some pieces of quartz that contain tiny bits of gold. Gold! But only a tiny bit. If only you knew where those rocks came from, you might make a fortune. But this stream is more than a hundred miles long. Those rocks could have come from anywhere along the stream. How can you find where they came from?
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