Decomposition rates are low under very wet or very dry conditions. There are distinct wet and dry seasons. Rooms with wet and dry steam were also available. Autumn alternates between wet and dry periods. It may present as either wet or dry beriberi. The climate varies between tropical wet, tropical wet and dry, and semi arid. Productivity varies between wet and dry areas. Cartagena features a tropical wet and dry climate. Namely; a dry and a wet seasons. Equatorial Guinea has a tropical climate with distinct wet and dry seasons. The industry also uses combinations of wet and dry. Somaliland's climate is a mixture of wet and dry conditions. Mexico has pronounced wet and dry seasons. There are wet and dry field electrosurgical devices. There are periods lasting from five to twenty years of relatively wet or dry years.