Waterfall

A waterfall is a place where water flows over a vertical drop in the course of a stream or river. Waterfalls also occur where meltwater drops over the edge of a tabular iceberg or ice shelf.

Formation

Waterfalls are commonly formed in the upper course of the river. At these times the channel is often narrow and deep. When the river courses over resistant bedrock, erosion happens slowly, while downstream the erosion occurs more rapidly. As the watercourse increases its velocity at the edge of the waterfall, it plucks material from the riverbed. Whirlpools created in the turbulence as well as sand and stones carried by the watercourse increase the erosion capacity. This causes the waterfall to carve deeper into the bed and to recede upstream. Often over time, the waterfall will recede back to form a canyon or gorge downstream as it recedes upstream, and it will carve deeper into the ridge above it. The rate of retreat for a waterfall can be as high as one and half meters per year.

Often, the rock stratum just below the more resistant shelf will be of a softer type, meaning that undercutting due to splashback will occur here to form a shallow cave-like formation known as a rock shelter under and behind the waterfall. Eventually, the outcropping, more resistant cap rock will collapse under pressure to add blocks of rock to the base of the waterfall. These blocks of rock are then broken down into smaller boulders by attrition as they collide with each other, and they also erode the base of the waterfall by abrasion, creating a deep plunge pool or gorge.

Waterfall (Carly Simon song)

"Waterfall" is a song written and performed by Carly Simon, and produced by Richard Perry. The song served as the second single from Simon's fifth studio album, Playing Possum.

Waterfall was not as successful on the Billboard Pop singles chart as its predecessor "Attitude Dancing", peaking only at #78. However, it was much more successful on the Billboard Adult Contemporary chart, reaching a peak position of #21.

Simon later included the track on her 2002 career retrospective set, Anthology.James Taylor provides backing vocals on the track.

Track listing

Charts

References

External links

Waterfall (album)

Waterfall is the fourth album released for the American market by the English jazz rock band If. It was first issued in 1972 and reached #195 on the Billboard Pop Albums Chart.

It is a rearranged version of If 4, containing two tracks, "Paint Your Pictures" and "Cast No Shadows", in substitution of "You in Your Small Corner" and "Svenska Soma", which had been released on IF 4. The original recording line-up was modified to include two new members, Cliff Davies and Dave Wintour, who filled the drum and bass chairs in substitution of Dennis Elliott and Jim Richardson, respectively.

The album was recorded in London at Command Studios in February and at Morgan Studios in July 1972.

Track listing

Bonus tracks on CD release from 2003:

Lucid (programming language)

Lucid is a dataflow programming language. It is designed to experiment with non-von Neumann programming models. It was designed by Bill Wadge and Ed Ashcroft and described in the book Lucid, the Dataflow Programming Language.

Model

Lucid uses a demand-driven model for data computation. Each statement can be understood as an equation defining a network of processors and communication lines between them through which data flows. Each variable is an infinite stream of values and every function is a filter or a transformer. Iteration is simulated by 'current' values and 'fby' (read as 'followed by') operator allowing composition of streams.

Lucid is based on an algebra of histories, a history being an infinite sequence of data items. Operationally, a history can be thought of as a record of the changing values of a variable, history operations such as first and next can be understood in ways suggested by their names. Lucid was originally conceived as a kind of very disciplined, mathematically pure, single-assignment language, in which verification would be very much simplified. However, the dataflow interpretation has been a very important influence on the direction in which Lucid has evolved.

Lucid (film)

Lucid is a 2005 Canadian film written and directed by Sean Garrity. It won the award for Best Western Canadian Feature Film at the Vancouver International Film Festival in 2005 and it was nominated for Best Film at the Mannheim-Heidelberg International Film Festival in 2006.

Plot

Joel Rothman (Jonas Chernick) is suffering from insomnia after having massive problems in his personal life including a separation and being targeted by his boss. As a psychotherapist he is assigned three patients suffering from Post Traumatic Stress Disorder. He must treat them to figure out his own life.

External links

Lucid (album)

Lucid is the fifth studio album by American R&B singer Lyfe Jennings. The album was released on October 8, 2013, by Mass Appeal Entertainment. On May 8, 2013, the album's first single "Boomerang" was released. On July 25, 2013, the music video was released for "Boomerang".

Critical response

Lucid was met with a generally positive reviews from music critics. Andy Kellman of AllMusic gave the album three out of four stars, saying "Jennings draws character sketches, spins cautionary tales—as someone still growing, learning from his mistakes—and largely sticks to the type of mature R&B that his listeners don't get from anyone else. He briefly breaks from the norm with "Rock," a classy but contemporary steppers groove that's one of his best songs. Despite a mostly new cast of collaborators—including TGT associate Brandon Hodge and producer/songwriter Lashaunda "Babygirl" Carr—Lucid is a natural progression for a veteran artist who seems to have plenty left to express."

Track listing