1. Η γραμμή του ορίζοντα ΤΑΞΗ Γ΄ ΕΝΟΤΗΤΑ 1 1 η Παρουσίαση

2. http://www.sundancevillas.co.uk/products.asp?prod=36&cat=68&hierarchy=0

3. http://www.123rf.com/photo_1195146_horizon-sky-nature-light-sea.html

4. http://www.viewphotos.org/united-states/images-of-COTUIT-7768.html

5. http://lilstarrz09.blogspot.com/2012/04/calmness.html

6. http://flickrhivemind.net/Tags/%CF%87%CF%89%CF%81%CE%AC%CF%86%CE%B9/Interesting

7. http://www.flickr.com/photos/33284937@N04/4794151024/sizes/m/in/photostream/

8. http://www.flickr.com/photos/33284937@N04/4771132618/sizes/l/in/photostream/

9. http://www.flickr.com/photos/33284937@N04/4767842534/sizes/o/in/photostream/

10. http://www.flickr.com/photos/chroniss/4614159815/sizes/l/in/photostream/

11. http://www.flickr.com/photos/30818124@N08/3740274314/sizes/l/in/photostream/

12. http://anastasiosk.blogspot.com/2011/09/blog-post_27.html