https://www.dkfindout.com/uk/dinosaurs-and-prehistoric-life/fossils/

http://www.sciencekids.co.nz/sciencefacts/earth/fossils.html

http://easyscienceforkids.com/fossils-quiz-fun-free-interactive-general-quiz-questions-for-kids/

https://www.bbc.co.uk/education/topics/z9bbkqt

http://www.bbc.co.uk/guides/z2ym2p3