A trough or sluice having cleats, grooves, or steps across the bottom for holding quicksilver and catching particles of gold when auriferous earth is washed. Also one of the cleats, grooves or steps in such trough
Mail prepared so that 10 or more contiguous mailpieces are addressed to the same ZIP Code destination Also to check that mail is in ZIP Code sequence by thumbing quickly through the top of a tray of mail or along the side of a bundle of mail
A bar of material with a rippled surface deposited on the bed of a river or stream The smooth flow of water is disrupted when it passes over a riffle causing it to mix and allowing it to take up more oxygen Riffles can harbour rich ASSEMBLAGES of freshwater INVERTEBRATES and MOSSES
Section of stream containing gravel or rubble, in which surface water is at least slightly turbulent and current, is swift enough that the surface of the gravel and rubble is kept fairly free from sand and silt
A shallow, gravelly section in a stream where water is breaking over rocks or other partially submerged organic debris with swift current Used for spawning by salmons and other fishes
shuffling by splitting the pack and interweaving the two halves at their corners shuffle (playing cards) by separating the deck into two parts and riffling with the thumbs so the cards intermix
A reach of stream in which the water flow is rapid and usually more shallow than the reaches above and below Natural streams often consist of a succession of pools and riffles
A trough or sluice having cleats, grooves, or steps across the bottom for holding quicksilver and catching particles of gold when auriferous earth is washed; also, one of the cleats, grooves, or steps in such a trough
A shallow rapid with very small waves, often over a sand or gravelbottom Does not rate a grade on either the Western or the International scale of difficulty
If you riffle through the pages of a book or riffle them, you turn them over quickly, without reading everything that is on them. I riffled through the pages until I reached the index. = flick. to move and quickly look at pieces of paper or the pages of a book, magazine etc flip through (Perhaps from ripple + ruffle)