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Excavation is the best-known and most commonly used technique within the science of archaeology. Individual excavations are normally referred to simply as "digs" by those who participate, this being an over-literal description of the process. An excavation concerns itself with a specific archaeological site or connected series of sites, and may be carried on over a number of years, since the work tends to be seasonal.

A dump truck or production truck is a truck used for transporting loose material (such as sand, gravel, or dirt) for construction. A typical dump truck is equipped with a hydraulically operated open-box bed hinged at the rear, the front of which can be lifted up to allow the contents to be deposited on the ground behind the truck at the site of delivery.

A backhoe, also called a rear actor or back actor, is a piece of excavating equipment consisting of a digging bucket on the end of an articulated arm (also called a stick or dipper). Modern backhoes are powered by hydraulics. They are typically mounted on the back of a tractor or front loader. Similar attachments for skid loaders are still called backhoes even though they are mounted on the front. This is because the name refers to the action of the shovel, not its location on the vehicle; a backhoe digs by drawing earth backwards, rather than lifting it with a forward motion like a

A bulldozer is a very powerful crawler (caterpillar tracked tractor) equipped with a blade. The term "bulldozer" is often used to mean any heavy engineering vehicle, but precisely, the term refers only to a tractor (usually tracked) fitted with a dozer blade. That is the meaning used herein.

Tractor, in agriculture, vehicle used to pull such equipment as plows, cultivators, and mowers; to power stationary devices such as saws and winches; and to push snowplows and earth-moving implements. Early tractors were steam-driven; now they are generally powered by gasoline or diesel engines. The two main types are wheeled tractors and crawlers, or caterpillars, which move on treads. Advances in technology resulted in the number of tractors in the United States increasing from 600 in 1907 to 3.4 million by 1950. The power takeoff, which transmitted power from the tractor engine to an implement via a shaft, was introduced in 1918. The small general-purpose tractor followed c.1924. Pneumatic rubber tires, affording increased speed, easier operation, lower fuel consumption, and longer wear, were introduced in 1932. Four-wheel drive and diesel power increased pulling power in the 1950s and 60s. These advances led to today's very large, double-tired tractors with enclosed, air-conditioned cabs, capable of pulling several gangs of plows.

Soil is the collection of natural bodies that form in earthy material on the land surface. The term is popularly applied to the material on the surface of the earth's moon and Mars, a usage acceptable within a portion of the scientific community.

Waste falls into a number of different waste types. It can exist in any phase of matter (solid, liquid, or gas) or as waste heat. When released in the latter two states the wastes can be referred to as emissions. It is usually strongly linked with pollution. Waste may also be intangible in the case of wasted time or wasted opportunities. Here waste refers to things which are used inefficiently or inappropriately.

The use of artificial masonry similar to modern concrete dates from a remote period but did not become a standard technique of construction until the Romans adopted it (after the 2d cent. B.C.) for roads, immense buildings, and engineering works. The concrete of the Romans, formed by combining pozzuolana (a volcanic earth) with lime, broken stones, bricks, and tuff, was easily produced and had great durability (the Pantheon of Rome and the Baths of Caracalla were built with it). Enormous spaces could be roofed without lateral thrusts by vaults cast in the rigid homogeneous material.

Los Angeles is a shipping, industrial, communication, financial, fashion, and distribution center for the W United States and much of the Pacific Rim. It is also the motion picture, television, radio, and recording capital of the United States, if not the world, housing numerous studios. Once an agricultural distribution center, Los Angeles is a leading producer of clothing and textiles, aircraft, computers and software, paper, toys, glass, furniture, wire, biomedical products, electrical and electronic machinery, pharmaceuticals, petrochemicals, and fabricated metal. Tourism, printing and publishing, food processing, and oil refining are also important.

Los Angeles has one of the busiest ports in the United States, with roughly half of its commerce coming from other nations, and its international airport is one of the world's busiest. The metropolitan area's vast freeway system has made Los Angeles the archetypal auto-dependent urban area. The huge number of motor vehicles, combined with the city's valley location, often creates dangerously high smog levels. A light-rail system (opened in 1990) and buses alleviate freeway congestion only a little; a new subway (completed 2000) also provides insignificant relief.

Maintaining an adequate water supply has long been a problem for Los Angeles. The city obtains most of its water from California's Central Valley to the north. In 1992 the city ended protracted litigation with environmentalists when it agreed to curtail water diversion in certain areas until ecological recovery had been achieved.