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Image Sources

Picture(s) Source Link  
3   https://www.maxpixel.net/Nature-Biosphere-Animal-Potsdam-Butterfly-4735779  
4 NASA https://visibleearth.nasa.gov/images/57723/the-blue-marble  
5, 9, 19, 21 Kirsten Elger    
7, 24 Franziska Alberg    
10 International Centre for Global Earth Models (ICGEM) http://doi.org/10.5194/essd-11-647-2019  
11   https://pxhere.com/en/photo/549222  
14 Matthias Rosenau    
15   https://pixnio.com/events-happenings/the-tsunami-flooding-completely-destroyed-apartment-buildings  
16 Harshal Sawai https://in.pinterest.com/pin/686728643177778383/  
18 Ulrich Harms