21.   Most of the areas where mining companies can conveniently put the rubble is near stream beds.

22.   Nitrogen, in the form of nitrates and other compounds, is converted by bacteria in the stream bed into nitrogen gas, which bubbles up into the atmosphere.

23.   Some fly only along stream beds.

24.   Stream beds are sensitive to grazing cattle.

25.   The Pakistani and Indian soldiers are so close that they can shout to each other across the dry stream bed that separates them.

26.   The trip downstream will be a combination of boulder-hopping in the stream bed and climbs along the side of the canyon.

27.   They came upon the second fort on a plateau overlooking the Minar wadi, a valley with a dry stream bed.

28.   They worry about what happens when mountain bikes cause just as much damage to the little stream bed as does a strip-and-run mining operation.

29.   They spotted two halves of a maxilla, or upper jaw, that had eroded out of the side of a barren hill near a dry stream bed.