<P> Mollisols occur in savannahs and mountain valleys ( such as Central Asia , or the North American Great Plains ) . These environments have historically been strongly influenced by fire and abundant pedoturbation from organisms such as ants and earthworms . It was estimated that in 2003 , only 14 to 26 percent of grassland ecosystems still remained in a relatively natural state ( that is , they were not used for agriculture due to the fertility of the A horizon ) . Globally , they represent ~ 7 % of ice - free land area . As the world 's most agriculturally productive soil order , the Mollisols represent one of the more economically important soil orders . </P>
what part of the country are you likely to find the majority of the mollisols
Great Plains