Context: Wind is the flow of gases on a large scale. On the surface of the Earth, wind consists of the bulk movement of air. In outer space, solar wind is the movement of gases or charged particles from the Sun through space, while planetary wind is the outgassing of light chemical elements from a planet's atmosphere into space. Winds are commonly classified by their spatial scale, their speed, the types of forces that cause them, the regions in which they occur, and their effect. The strongest observed winds on a planet in the Solar System occur on Neptune and Saturn. Winds have various aspects, an important one being its velocity; another the density of the gas involved; another its energy content or wind energy., A roof is part of a building envelope. It is the covering on the uppermost part of a building or shelter which provides protection from animals and weather, notably rain or snow, but also heat, wind and sunlight. The word also denotes the framing or structure which supports that covering., American English (variously abbreviated AmE, AE, AmEng, USEng, en-US), also called United States English or U.S. English, is the set of varieties of the English language native to the United States. English is the most widely spoken language in the United States and is the common language used by the federal government, considered the "de facto" language of the country because of its widespread use. English has been given official status by 32 of the 50 state governments. As an example, while both Spanish and English have equivalent status in the local courts of Puerto Rico. Under federal law, English is the official language for any matters being referred to the United States district court for the territory., In American English, walkway is a composite or umbrella term for all engineered surfaces or structures which support the use of trails., A parapet is a barrier which is an extension of the wall at the edge of a roof , terrace , balcony , walkway or other structure . The word comes ultimately from the Italian parapetto ( parare = to cover / defend and petto = breast ) . The German term Brustwehr has the same significance . Where extending above a roof , a parapet may simply be the portion of an exterior wall that continues above the line of the roof surface , or may be a continuation of a vertical feature beneath the roof such as a fire wall or party wall . Parapets were originally used to defend buildings from military attack , but today they are primarily used as guard rails and to prevent the spread of fires ., Weather is the state of the atmosphere, to the degree that it is hot or cold, wet or dry, calm or stormy, clear or cloudy. Most weather phenomena occur in the troposphere, just below the stratosphere. Weather refers to day-to-day temperature and precipitation activity, whereas climate is the term for the statistics of atmospheric conditions over longer periods of time. When used without qualification, "weather" is generally understood to mean the weather of Earth., Guard rail or guardrail, sometimes referred to as guide rail or railing, is a system designed to keep people or vehicles from (in most cases unintentionally) straying into dangerous or off-limits areas. A handrail is less restrictive than a guard rail and provides both support and the protective limitation of a boundary., Sunlight is a portion of the electromagnetic radiation given off by the Sun, in particular infrared, visible, and ultraviolet light. On Earth, sunlight is filtered through Earth's atmosphere, and is obvious as daylight when the Sun is above the horizon. When the direct solar radiation is not blocked by clouds, it is experienced as sunshine, a combination of bright light and radiant heat. When it is blocked by clouds or reflects off other objects, it is experienced as diffused light. The World Meteorological Organization uses the term "sunshine duration" to mean the cumulative time during which an area receives direct irradiance from the Sun of at least 120 watts per square meter. Other sources indicate an "Average over the entire earth" of "164 Watts per square meter over a 24 hour day"., Subject: parapet, Relation: different_from, Options: (A) government (B) railing (C) state (D) sun
Output: railing