Webografie:

https://www.wwf.org.uk/where-we-work/frozen-environments

Alexandra Kobalenko/Getty

https://ro.wikipedia.org/wiki/Regiune_polar%C4%83

https://www.iainrudkin.com/Mountaineering/

https://ro.wikipedia.org/wiki/Pinguin_imperial

Thecuriosityworkshop.com

https://ro.wikipedia.org/wiki/Mors%C4%83

https://alkzik.wordpress.com/2020/03/30/

america-diferentieri-climatice-si-biogeografice/

https://photorator.com/photo/48832/theres-something-about-our-boreal-forests-this-time-of-year-that-seems-magical-to-me-fairbank-alaska

http://www.arcticatlas.org/photos/pltspecies/spp_details.php?queryID=FLNI

http://www.plant-identification.co.uk/skye/cyperaceae/carex-bigelowii.htm

https://animale.club/wp-content/uploads/2018/06/albatros-calator-2.jpg

https://minunileplanetei.com/europa/migratia-renilor-finlanda/

https://upload.wikimedia.org/wikipedia/commons/4/4d/Gull_ca_usa.jpg

Silviu Neguț, Mihai Ielenicz, Marius-Cristian Neacșu, Alexandru Bărbulescu, Dan Bălteanu.  Geografie: manual pentru clasa a XI-a. București: Humanitas Educațional, 2012. ISBN 978-973-50-3720-8

https://ro.wikipedia.org/wiki/Climat_polar

https://prezi.com/8oer5qfvrvds/mediul-polar/

https://ro.wikipedia.org/wiki/Regiune_polar%C4%83

https://ro.wikipedia.org/wiki/Polul_Nord

https://prezi.com/8oer5qfvrvds/mediul-polar/

https://en.wikipedia.org/wiki/Tundra

https://en.wikipedia.org/wiki/Ellesmere_Island

https://ro.wikipedia.org/wiki/Tundr%C4%83

https://prezi.com/p/3ipchxs7ss-j/mediul-subpolar-de-tundra/?frame=d1217cc5b212f7f67e7485e5ce2afcb768ef91aa

https://www.britannica.com/place/Arctic