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.
Images. A380-800 aircraft developed by Airbus is the largest aircraft in the world. The first Boeing 777-300 aircraft was delivered in May 1998. Boeing 747-400 is the most popular aircraft in the Boeing 747 family.he Boeing 777-200 with a maximum seating capacity of 440 is currently the sixth biggest passenger aircraft in the world. It offers 305 and 400 seats respectively in the three-class and two-class configurations.