The border free Schengen Area guarantees free movement to EU citizens, along with non-EU nationals living in the EU or visiting the EU as tourists, exchange students or for business purposes.| Migration and Home Affairs
Water quality, particularly the quality of drinking water, is arguably the most essential requirement for the survival of not only mankind, but all terrestrial life on Earth. Despite its importance, water quality is not guaranteed and varies considerably throughout the world’s countries, influenced by natural and man-made factors.| worldpopulationreview.com
