Gravel

Gravel /ˈɡrævəl/ is composed of unconsolidated rock fragments that have a general particle size range and include size classes from granule- to boulder-sized fragments. Gravel is categorized by the Udden-Wentworth scale into granular gravel (2 to 4 mm or 0.079 to 0.157 in) and pebble gravel (4 to 64 mm or 0.2 to 2.5 in). One cubic yard of gravel typically weighs about 3000 pounds (or a cubic metre is about 1,800 kilograms).

Gravel is an important commercial product, with a number of applications. Many roadways are surfaced with gravel, especially in rural areas where there is little traffic. Globally, far more roads are surfaced with gravel than with concrete or tarmac; Russia alone has over 400,000 km (250,000 mi) of gravel roads. Both sand and small gravel are also important for the manufacture of concrete.

Geological formation

Large gravel deposits are a common geological feature, being formed as a result of the weathering and erosion of rocks. The action of rivers and waves tends to pile up gravel in large accumulations. This can sometimes result in gravel becoming compacted and concreted into the sedimentary rock called conglomerate. Where natural gravel deposits are insufficient for human purposes, gravel is often produced by quarrying and crushing hard-wearing rocks, such as sandstone, limestone, or basalt. Quarries where gravel is extracted are known as gravel pits. Southern England possesses particularly large concentrations of them due to the widespread deposition of gravel in the region during the Ice Ages.

Gravel (surname)

Gravel or Gravell is a surname. Notable people with the surname include:

Gravel (disambiguation)

Gravel is a type of rock.

Gravel or Gravell may also refer to:

Places

Music and entertainment

Pry

Pry can refer to:

See also

Pry (software)

Pry is an interactive shell for the Ruby programming language. It is notable for its Smalltalk-inspired ability to start a REPL within a running program. This lets programmers debug and modify the current state of a system.

Features

Pry exposes most of its introspective capabilities using a filesystem metaphor. For example, it has a `cd` command to start interacting with a particular object, and uses `ls` to list methods and variables.

It is possible to start Pry at any point inside a running program. Due to the reflective nature of Ruby, this lets the programmer inspect the program, change its current state, or correct the source code without restarting the process.

A number of third party plugins are available for Pry, these add tighter integration with other Ruby projects, enhance the abilities of Pry itself, and make Pry available over a remote connection.

Competitors

The main competitor to Pry is IRB, a standalone interactive shell that is packaged with releases of the Ruby programming language. There are a reasonable number of third-party plugins that add features to make IRB behave more like Pry, packaged as irbtools.

PRY

PRY may refer to:

See also