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Remote-sensing techniques allow crucial data to be collected for eruption forecasting , while minimizing the hazard to scientific investigators . The aim of this course is to introduce students who already have a good knowledge of German to the language of commerce and management in German . You will learn basic skills to enable you to make yourself understood and to find out information in everyday situations . If your irises have been unaffected in the past , you do not need to use an insecticide to protect them . The redistribution of solar energy over the globe is central to studies in climate .