what are the main characteristics of the great plains?
['enormous size.', 'lack of trees.', 'semi-arid - little water available.', 'unpredictable weather, including extremely cold and violent winters.', "ferocious winds - the winter 'Northers' and the scorching summer winds.", 'many areas flat and featureless.', 'inhabited by locusts and grasshoppers.', 'inhabited by wolves.']