Scarp retreat
Scarp retreat is a geological process through which the location of an escarpment changes over time. Typically the cliff is undermined, rocks fall and form a talus slope, the talus is chemically or mechanically weathered and then removed through water or wind erosion, and the process of undermining resumes. Scarps may retreat for tens of kilometers in this way over relatively short geological time spans, even in arid locations.
Scarp profiles
A scarp is a line of cliffs that has usually been formed by faulting or erosion. If it is protected by a strong caprock, or if it contains vertical fractures, it may retain its steep profile as it retreats. Scarps in dry climates typically have a near-vertical upper face, that may account for 10% - 75% of the total height, with a talus-covered sloping rampart forming the lower section. The caprock is undermined as the rampart and face are eroded, and eventually a section collapses. A strong caprock will typically create a relatively high cliff, since more undermining is needed to cause it to fail. Other factors determining how easily a cliff will fail are the bedding and jointing, direction of dip and thickness of the caprock. A thin caprock will result in low cliffs that retreat quickly.
Retreat
Retreat or re-treat may refer to:
Places
Great Britain
South Africa
United States
Art, entertainment, and media
Film
Music
Retreat (Cries My Heart)
"Retreat (Cries My Heart)" is a popular song, written by Nancy Farnsworth, Tommy Furtado, and Anita Boyer in 1952.
The most popular version was recorded by Patti Page in the same year.
Bugle call
A bugle call is a short tune, originating as a military signal announcing scheduled and certain non-scheduled events on a military installation, battlefield, or ship. Historically, bugles, drums, and other loud musical instruments were used for clear communication in the noise and confusion of a battlefield. Naval bugle calls were also used to command the crew of many warships (signaling between ships being by flaghoist, semaphore, signal lamp or other means).
A defining feature of a bugle call is that it consists only of notes from a single overtone series. This is in fact a requirement if it is to be playable on a bugle or equivalently on a trumpet without moving the valves. (If a bandsman plays calls on a trumpet, for example, one particular key may be favored or even prescribed, such as: all calls to be played with the first valve down.)
Bugle calls typically indicated the change in daily routines of camp. Every duty around camp had its own bugle call, and since cavalry had horses to look after, they heard twice as many signals as regular infantry. "Boots and Saddles" was the most imperative of these signals and could be sounded without warning at any time of day or night, signaling the men to equip themselves and their mounts immediately. Bugle calls also relayed commanders' orders on the battlefield, signaling the troops to Go Forward, To the Left, To the Right, About, Rally on the Chief, Trot, Gallop, Rise up, Lay down, Commence Firing, Cease Firing, Disperse, and other specific actions.
Podcasts:
