Sulfate-reducing microorganisms are responsible for the sulfurous odors of salt marshes and mud flats. Much of the hydrogen sulfide will react with metal ions in the water to produce metal sulfides. These metal sulfides, such as ferrous sulfide (FeS), are insoluble and often black or brown, leading to the dark color of sludge.
The largest aircraft used for a scheduled domestic service in the USA that is a DOMESTIC route only, is the Boeing 777, though the most common is a Boeing 757 and 767. Some airlines use larger aircraft on domestic legs on an international flight throughout the USA, which do include the 747, however some airlines don't have a license to carry domestic passengers on those routes.
The Airbus A380 is a double-deck, wide-body, four-engine jet airliner manufactured by the European aircraft company Airbus. It is the world's largest passenger airliner, and the airports at which it operates have upgraded facilities to accommodate it.s of September 2015, Airbus had received 317 firm orders and delivered 171 aircraft; Emirates is the biggest A380 customer with 140 on order and 67 delivered.