Grasslands are natural ecological communities dominated by grasses and with no or only sparse tree or shrub cover. They are dominated by a range of grass species but contain a diversity of other herbs. Grasslands are among the most species rich plant communities in Australia.
Secondary or derived grasslands are those in which the woody species (trees and/or shrubs) have been removed, leaving only the native herbaceous ground layer.
A tornado is a violently rotating column of air that spins while in contact with both the surface of the Earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloud.
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