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 0.16 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.
Other articles related to "gravel, gravels":
... created utilising rigid or flexible plastic pipes pierced with holes, laid in pea gravel ... (The pea gravel is pea sized pebbles without sharp points to damage to pipe.) Geotextile material can surround the gravel to keep out silt ... available that can form the hole, insert the perforated pipe (and gravel if required), all in one simultaneous and continuous process ...
... 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 ...
... In 1960 and 1961, the film Black Gravel (Schwarzer Kies) directed by Helmut Käutner, was shot in Lautzenhausen ... The film tells the story of a man named Robert Neidhardt (Helmut Wildt), a gravel dealer in the fictitious village of "Sohnen", who, on the sly, sells gravel to smaller companies which was meant for ... The use of the German word schwarz ("black") in the title does not refer to the gravel's colour, but rather imparts the meaning of illegality, as in "black market" ...
... Camille Francis Gravel, Jr ... Gravel spent much time and money supporting the Roman Catholic Church ...
... Glacier Northwest, Maury island has one of the largest reserves of gravel rock, and, because it is an island, the gravel can be easily transported on barges to other areas of the Pacific Northwest ...
Famous quotes containing the word gravel:
“Let the new faces play what tricks they will
In the old rooms; night can outbalance day,
Our shadows rove the garden gravel still,
The living seem more shadowy than they.”
—William Butler Yeats (18651939)
“Lay me a green sod under my head,
And another at my feet;
And lay my bent bow at my side,
Which was my music sweet;
And make my grave of gravel and green,
Which is most right and meet.”
—Unknown. Robin Hoods Death (l. 6570)