Ridge

A ridge or mountain ridge is a geological feature consisting of a chain of mountains or hills that form a continuous elevated crest for some distance. Ridges are usually termed hills or mountains as well, depending on size. There are several main types of ridges:-

Ridge (meteorology)

A ridge is an elongated region of relatively high atmospheric pressure, the opposite of a trough.

In hydrologic terms, a line or wall of broken ice forced up by pressure. May be fresh or weathered.

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Ridge (differential geometry)

In differential geometry, a smooth surface in three dimensions has a ridge point when a line of curvature has a local maximum or minimum of principal curvature. The set of ridge points form curves on the surface called ridges.

The ridges of a given surface fall into two families, typically designated red and blue, depending on which of the two principal curvatures has an extremum.

At umbilical points the colour of a ridge will change from red to blue. There are two main cases: one has three ridge lines passing through the umbilic, and the other has one line passing through it.

Ridge lines correspond to cuspidal edges on the focal surface.

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Hill

A hill is a landform that extends above the surrounding terrain. It often has a distinct summit, although in areas with scarp/dip topography a hill may refer to a particular section of flat terrain without a massive summit (e.g. Box Hill, Surrey).

Terminology

The distinction between a hill and a mountain is unclear and largely subjective, but a hill is universally considered to be less tall and less steep than a mountain. In the United Kingdom, geographers historically regarded mountains as hills greater than 1,000 feet (300 m) above sea level, which formed the basis of the plot of the 1995 film The Englishman Who Went Up a Hill But Came Down a Mountain. In contrast, hillwalkers have tended to regard mountains as peaks 2,000 feet (610 m) above sea level: the Oxford English Dictionary also suggests a limit of 2,000 feet (610 m) and Whittow states "Some authorities regard eminences above 600 m (2,000 ft) as mountains, those below being referred to as hills." The Great Soviet Encyclopedia defines hill as an upland with a relative height up to 200 m (660 ft).

Hill (surname)

Hill is a surname of English origin, meaning "a person who lived on a hill", or derived from the Greek or Latin name Hilary or Hillary. It is the 36th most common surname in England and 37th most common in the United States.

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Hill (Sussex cricketer)

Hill (first name and details unknown) was an English cricketer who played for pre-county club Sussex. He made a single first-class appearance for the team, against 1825, against pre-county club Hampshire.

Batting as an opener, Hill scored 6 runs in the first innings, and 1 run in the second.

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