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Mud goes with a flood:2

All kinds of material are carried by a flood.

Any big stones are quickly dropped close to the channel, but sand may be carried a long way onto the floodplain. Mud travels farthest of all.

But a flood carries something else: invisible dissolved material. Like the mud, it gets trapped in the soil and makes it fertile. So a flood is not all bad news.

1. READ/play the text
2. CLICK the picture (and video)
3. TRY this:

Q1: Water can slowly dissolve rock. But where does mud and sand come from?

[Answer]