### formation:

Landfill
* Many landfills also accept used oil for recycling.
* Most landfills attract rats
  - contain tires
  - have areas where citizens can get rid of hazardous waste also
  - provide municipal services
* Some landfills collect green waste that is composted on site for resale
  - contain household and industrial chemicals
  - have a system that collects the methane gas so that it can be used as a fuel source
  - produce a toxic liquid called leachate as they decompose
* actually discourage biodegration.
* are a designated place where garbage is buried underground
  - among some of the largest man-made structures on earth
  - emission sources of particulates and gases
  - engineered areas where waste is placed into the land
  - fewer, but can accept more solid waste
  - lowland
  - often in low-lying areas where refuse is buried between layers of earth
  - rich sources of methane
  - significant job generators for rural communities
  - the largest single source, comprising almost a third of methane emissions
* are the largest source of human-caused methane emissions in the United States
  - methane pollution in the United States
  - places that our garbage is taken to be buried
  - worst place to put used plastics
  - therefore more susceptible to lightning strikes than is flat ground
  - undesirable neighbors, affecting property values and community image
  - unpleasant to look at, reduce land values, and pose health risks
  - usually capped and lined in order to contain waste
  - waste management structures where waste is placed into the land
  - worth checking even in summer, as non-breeding birds can turn up at any time
* attract birds
  - rats, roaches, and pigeons
* bans Many countries insist that certain materials, if untreated, are kept out of landfills.
* can be a wasted opportunity, and produces greenhouse gases
  - major sources of water and air pollution
  - collect the methane gas, purify it, and then use it as an energy source
  - contain toxic and hazardous materials
  - pose environmental risks to human health and the environment
* consist of areas or 'cells' of waste, spread and compacted within discrete areas.
* contain matter
* contents leach chemicals, it is their nature.
* covers keep moisture from reaching the landfill.
* end up being big piles of rubbish and dirt.
* generate odors, dust and blowing trash.
* have a longer lifespan, coal bills have dropped and agricultural production has increased
  - requirements for wastewater sludge disposal
* have the potential to pollute our surface and groundwater resources
  - pose a long-term threat to water supplies
* is lowland
* leachates and groundwater contamination.
* leak into our drinking water and their toxins return in fish.
* often contain hazardous substances leaching out into the surroundings
  - contaminate surface and groundwater
  - provide the wide open vistas that gulls prefer for feeding and loafing in safety
* produce and emit methane.
* produce methane as organic wastes decompose over time
  - when organic waste decomposes without oxygen
* provide for the ultimate disposal of a majority of waste generated throughout the region
* remains a dominant waste disposal method.
* sites Landfill produces methane, a harmful greenhouse gas.
* take up space.
* use soil for daily cover.
* usually have liner systems and other safeguards to prevent groundwater contamination.
* wastes produce gases, principally methane, as they decompose.

### formation | landfill:

Municipal landfill
* can accept hazardous waste under federal law.
* can, however, accept household hazardous waste.

Sanitary landfill
* are landfills
  - sites where waste is isolated from the environment until it is safe
* consist of a series of cells or sections.
* generate leachate, a complex mixture of organic and inorganic pollutants.

Metalwork
* are artifacts
  - work
* is duplicated in annealed iron or nails left in their natural state.