Ukraine natural resources in Ukraine include iron ore, coal, manganese, natural gas, oil, salt, sulphur, graphite, titanium, magnesium, kaolin, nickel, mercury, timber and an abundance of arable land. Despite this, the country faces a number of major environmental issues such as inadequate supplies of potable water; air- and water-pollution and deforestation, as well as radiation contamination in the north-east from the 1986 accident at the Chernobyl Nuclear Power Plant. Recycling toxic household waste is still in its infancy in Ukraine. From northwest to southeast the soils of Ukraine may be divided into three major aggregations: As much as two-thirds of the
Peaceful nuclear explosion many of the "tests" were considered economic applications, not tests, in the Nuclear Explosions for the National Economy program. These included one 30 kiloton explosion being used to close the Uzbekistani "Urtabulak" gas well in 1966 that had been blowing since 1963, and a few months later a 47 kiloton explosive was used to seal a higher pressure blowout at the nearby "Pamuk" gas field. (For more details, see Blowout (well drilling)#Use of nuclear explosions.) The public records for devices that produced the highest proportion of their yield via fusion-only reactions are possibly the Taiga Soviet peaceful nuclear explosions of