event, which can contribute to the cause of accidents and delayed flights. Ecology In ecological terms it is diversified. The composition and species varies according to climatic, pedological and rock formation. The biota differs from region to region. One of the ecosystems found are of field vegetation similar to North American prairies. Tree vegetation is rare, usually dominated by grasses and herbaceous. Sometimes it is interspersed with shrubs. Covering an area of 22,800 ha in 1996. The origin goes back to the own sandstone units found in the urban and rural environment. The trampling of the herds is responsible for the modification of the location and quantity of species that live in these fields. The renovation of the pasture is done by the slash-and-burn, a technique used a long time ago. Other paradigms for the original conservation of the vegetation is the inclusion of some species with seeds, decharacterizing the original phytogeographic region. The backing for affirmative is also indicated for the presence of agroindustries. Part of the lack of conservation is to for consider the fields as a monotonous vegetation without diversity. It usually appears in regions of smaller altimetric oscillations (for example: Furnas Formation in Itaiacoca or in the elevated portions of Uvaia with the Itararé Formation). Or also on poorer soils that do not have a long depth and is sandy, as seen near the Escarpa Devoniana towards the east of the municipality. There are two main types of photole vegetation: dry fields, formed in relatively flat places, usually in lithosols and poor cambisols. Among them are the Colchão Glass and the Forquilha Glass. It usually exists where there is no grazing, like east of the host district. The other subcategory, the dirty fields, has a few shrubs dominated by vassouras and maria-moles (and/or assa-peixes). There is the wet version with species adapted to humidity that arise in depressions. Native vegetation of Araucaria moist forests is also found, in total there are 23,500 ha, being therefore the largest natural ecosystem found in the area. Until the Pleistocene was dominated a drier climate that assists the presence of fields, however, as the climate began to become wetter at the end of the geological period and so it was advanced appearing mainly near ciliary or gallery forests (such as those found near the Cara-Cará River or Olarias Arroyo and in municipal conservation units such as Boca da Ronda and