Question: Cross country running is a sport in which teams and individuals run a race on open-air courses over natural terrain such as?

Context paragraphs:
English Cross Country Association: The English Cross Country Association (ECCA) is the governing body of cross country running in England.  Its objectives are to promote and develop cross country running and to advance and safeguard the interests of the sport and the governing body.  It organises the

Cross country running: Cross country running is a sport in which teams and individuals run a race on open-air courses over natural terrain such as dirt or grass.  Sometimes the runners are referred to as "harriers" (dogs).  The course, typically 4 - long, may include surfaces of grass, and earth, pass through woodlands and open country, and include hills, flat ground and sometimes gravel road.  It is both an individual and a team sport; runners are judged on individual times and teams by a points-scoring method.  Both men and women of all ages compete in cross country, which usually takes place during autumn and winter, and can include weather conditions of rain, sleet, snow or hail, and a wide range of temperatures.

1975 NCAA Division I Cross Country Championships: The 1975 NCAA Division I Men's Cross Country Championships were the 37th annual cross country meet to determine the team and individual national champions of NCAA Division I men's collegiate cross country running in the United States.  Held on November 24, 1975, the meet was hosted by Penn State University at the Penn State Golf Courses in State College, Pennsylvania.  The distance for this race was 6 miles (9.7 kilometers).  This was the final national meet at this distance.

Florida Gators cross country: The Florida Gators cross country program represents the University of Florida in the sport of cross country running.  The program includes separate men's and women's cross country teams, both of which compete in National Collegiate Athletic Association (NCAA) Division I and the Southeastern Conference (SEC).  The men's cross country team officially started in 1935; the women's team began in 1980.

Florida State Seminoles cross country: The Florida State Seminoles cross country program represents Florida State University (variously Florida State or FSU) in the sport of cross country running.  The program includes separate men's and women's cross country teams, both of which compete in National Collegiate Athletic Association (NCAA) Division I and the Atlantic Coast Conference (ACC).  The men's cross country team officially started in 1962; the women's team began in 1968.

Trail running: Trail running is a sport which consists of running and hiking over trails.  In the United Kingdom and Ireland it is also called mountain or fell running although the two types do differ.  It differs from road running and track running in that it generally takes place on hiking trails, often in mountainous terrain, where there can be much larger ascents and descents.  It is difficult to definitively distinguish trail running from cross country running.  In general, however, cross country is an IAAF governed discipline that is typically raced over shorter distances (rarely over 12 kilometers), whereas trail running is loosely governed, and run over longer routes.

Foot Locker Cross Country Championships: The Foot Locker Cross Country Championships are a series of annual cross country running races held in various regions of the United States to determine the premier cross country runner in various age groups, but mainly serves to find the best prep (high school) cross country athlete in the country.  The event began in 1979 by the F. W. Woolworth Company, which initially branded it as the Kinney Cross Country Championships, (for the Kinney Shoes division) in Balboa Park, San Diego, California before Woolworth rebranded the event in 1993 to its present title, the Foot Locker Cross Country Championships, as it still is today, for Woolworth's sporting goods company.  For most people associated with the sport, the name is just shortened to Foot Locker or even abbreviated in agate results as FL (the ticker symbol of the company today).  The event is the longest-running national cross country race for high school students.

Obstacle racing: Obstacle course racing (OCR) is a sport in which a competitor, traveling on foot, must overcome various physical challenges that are in the form of obstacles.  Mud and trail runs are combined and the races are designed to result in mental and physical collapse.  Obstacles include, but are not limited to, climbing over walls, carrying heavy objects, traversing bodies of water, crawling under barbed wire, and jumping through fire.  Many obstacles are similar to those used in military training, while others are unique to obstacle racing and are employed throughout the course to test endurance, strength, speed and, dexterity.  Races vary in both distance and challenge level, combining trail running, road running, and cross country running.  With race venues typically in large cities, organizers encourage athletes of all types to participate.  All Obstacles were introduced into Cross Country Running at Tough Guy, recorded on video 1989 - 2007.  Most signature obstacles were actually created by Mr Mouse.  According to the "Los Angeles Times" in 2012, the number of events—typically all-day festivals—rose rapidly.  In accordance with the sub-culture's fast rate of growth, the "Obstacle Race Magazine" was launched.

Sara McGreavy: Sara McGreavy, born 13 December 1982 in Leamington Spa is an English and UK international athlete.  Educated at North Leamington Community School and Arts College she excelled at cross-country.  After joining the Leamington Cycling and Athletics Club she became interested in 100m hurdles.  She won five times at The English Schools Championships over this distance.  Sarah also runs 60m hurdles indoors.

Great Edinburgh International Cross Country: The Great Edinburgh International Cross Country is an annual cross country running competition that takes place every January in Edinburgh, Scotland.  It is one of the competitions in the Great Run series of athletics events and is held alongside the Great Winter Run 5 kilometres mass participation race.  The event was first held in Edinburgh in 2005 after the city was awarded the Great North Cross Country which relocated from Durham.  The Great Edinburgh International Cross Country features three professional races: the men's 8 km race, the women's 6 km race, and the 4x1km relay.  It is an IAAF permit meeting, which means that performances can be used to qualify for the annual IAAF World Cross Country Championships.

Supporting paragraphs: Sara McGreavy Cross country running
Answer: dirt or grass