digplanet beta 1: Athena
Share digplanet:

Agriculture

Applied sciences

Arts

Belief

Business

Chronology

Culture

Education

Environment

Geography

Health

History

Humanities

Language

Law

Life

Mathematics

Nature

People

Politics

Science

Society

Technology

For other uses, see Gravel (disambiguation).
Gravel (largest fragment in this photo is about 4 cm)
Gravel being unloaded from a barge

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 sub-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.[citation needed] Both sand and small gravel are also important for the manufacture of concrete.

Geological formation[edit]

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.

Modern production[edit]

As of 2006, the United States is the world's leading producer and consumer of gravel.[1][2]

Etymology[edit]

The word gravel comes from the Old French word gravele.[3]

Types[edit]

Gravel with stones sized roughly between 5 and 15 millimeter.
Disused gravel pit in Lower Saxony, Germany

Multiple types of gravel have been recognized,[by whom?] including:

  • Bank gravel: naturally deposited gravel intermixed with sand or clay found in and next to rivers and streams. Also known as "Bank run" and "River run".
  • Bench gravel: a bed of gravel located on the side of a valley above the present stream bottom, indicating the former location of the stream bed when it was at a higher level.
  • Creek rock: this is generally rounded, semi-polished stones, potentially of a wide range of types, that are dredged or scooped from river beds and creek beds. It is also often used as concrete aggregate and less often as a paving surface.
  • Crushed stone: is rock crushed and graded by screens then mixed to a blend of stones and fines. It is widely used in as a surfacing for roads and driveways, sometimes with tar applied over it. Crushed stone may be made from granite, limestone, dolomite, and other rocks. Also known as "crusher run", DGA (Dense Grade Aggregate) QP (Quarry Process), and shoulder stone.[4]
  • Fine gravel: gravel consisting of particles with a diameter of 2 to 4 mm.
  • Lag gravel: a surface accumulation of coarse gravel produced by the removal of finer particles.
  • Pay gravel: also known as "pay dirt"; a nickname for gravel with a high concentration of gold and other precious metals. The metals are recovered through gold panning.
  • Pea gravel: gravel that consists of small, rounded stones used in concrete surfaces. Also used for walkways, driveways and as a substrate in home aquariums.
  • Piedmont gravel: a coarse gravel carried down from high places by mountain streams and deposited on relatively flat ground, where the water runs more slowly.
  • Plateau gravel: a layer of gravel on a plateau or other region above the height at which stream-terrace gravel is usually found.

Relationship to plantlife[edit]

In locales where gravelly soil is predominant, plant life is generally more sparse.[5] This outcome derives from the inferior ability of gravels to retain moisture, as well as the corresponding paucity of mineral nutrients, since finer soils that contain such minerals are present in smaller amounts.

See also[edit]

References[edit]


Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Gravel — Please support Wikipedia.
This page uses Creative Commons Licensed content from Wikipedia. A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia.
1000000 videos foundNext > 

How to Lay Out Gravel Landscaping : Landscaping Basics

Subscribe Now: http://www.youtube.com/subscription_center?add_user=ehowatHomeChannel Watch More: http://www.youtube.com/ehowatHomeChannel Laying out gravel l...

Gravel - O mano meilė

Tu šviesos spindulys, tiesos atspindys man visad buvai... Aš pradėjau tikėt, kad gali mylėt žmogus amžinai... mylėt amžinai... mylėt amžinai... O mano meilė ...

Gravel User Explains Drug

19News' Cody Weddle reports. Twitter: https://twitter.com/codyweddle Facebook: https://www.facebook.com/codyweddle19.

Gravel - Aš išpjoviau tavo širdį

A new drug called gravel is causing major problems for users and hospital personnel

This mixture, featuring bath salts and either methamphetamine or Klonopin, can make a person extremely paranoid and suicidal, said Dr. John Mettert, an emerg...

Installing a new Gravel Driveway

Excavating a lawn and installing a new gravel driveway. www.malvern-resurfacing.co.uk.

Gravel-Lok - Garden Path Installation

Gravel-Lok instructional video featuring tips and tricks from the pros.

Gravel - Easter song

Lietuvių indie/alternative roko grupė, išgarsėjusi sėkmingu dalyvavimu 2006 m. lietuviškoje „Eurovizijos" atrankoje. Joje Gravel pateko į finalą, kuriame išk...

Feed Me - Gravel

iTunes: http://glob.ly/3Lk Beatport: http://btprt.dj/V7Y2hD http://www.facebook.com/youfeedme http://mau5trap.com/ http://www.facebook.com/mau5trap.

Man Addicted To Eating Bricks, Mud and Gravel

Man Addicted To Eating Bricks, Mud and Gravel SUBSCRIBE: http://bit.ly/Oc61Hj AN Indian man says he is addicted to eating bricks, gravel and mud. Pakkirappa ...

1000000 videos foundNext > 

We're sorry, but there's no news about "Gravel" right now.

Loading

Oops, we seem to be having trouble contacting Twitter

Talk About Gravel

You can talk about Gravel with people all over the world in our discussions.

Support Wikipedia

A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia. Please add your support for Wikipedia!