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...n or near the surface of the earth, as opposed to underground or below the surface. The term is often used in various fields such as [[Ecology|ecology]], [[Ar ...ts it may refer specifically to transportation systems that operate on the surface, as opposed to underground.

...lists]], [[motorists]], [[vehicle passengers]], and passengers of [[public transportation]] vehicles. ...d surface marking]]: Any kind of device or material that is used on a road surface in order to convey official information.

...rmones, carbon dioxide (plasma being the main medium for excretory product transportation), and blood cells themselves. ...ce of red blood cells. The [[Rh factor]] is another type of antigen on the surface of red blood cells. People who have the Rh factor are Rh positive (Rh+), wh

...ss by which an object moves through an atmosphere without contact with the surface. [[Category:Transportation]]

...ids that nourish and protect the sperm and egg cells, and facilitate their transportation. * [[Exocrine Gland]]: A gland that secretes substances onto an epithelial surface by way of a duct.

...e process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what it would be without this atmosphere. * Transportation

* [[Pavement]]: The durable surface material laid down on an area intended to sustain vehicular or foot traffic [[Category:Transportation]]

...]]: The wind's ability to shape the surface of the Earth, through erosion, transportation, and deposition of sediment.

...eading from one place to another, especially one with a specially prepared surface that vehicles can use. [[Category:Transportation]]

...ived from an underground formation from which water flows naturally to the surface of the earth. ...ental impacts. These include the use of fossil fuels in the production and transportation of the bottles, as well as the pollution caused by the disposal of millions

...eading from one place to another, especially one with a specially prepared surface. "Traffic" (Early 19th century: from French traffique, Spanish tráfico, or [[Category:Transportation]]

..., relatively narrow, longitudinal runners that travels by sliding across a surface. Most sleds are used on surfaces with low friction, such as snow or ice. In [[Category:Transportation]]

...or illness. Types of ambulances used in the United States include ground (surface) ambulance, rotor-wing (helicopter), and fixed-wing aircraft (airplane). ...with those disabilities. Services may range from companion care, respite, transportation, community integration, crisis intervention and stabilization, supported em