Autumn 2021. Birch tree Autumn 2021. Birch tree https://www.globe.gov/c/message_boards/find_thread?p_l_id=18703103&threadId=83894814 2026-06-20T08:12:47Z 2026-06-20T08:12:47Z Autumn 2021. Birch tree Snježana Marković-Zoraja https://www.globe.gov/c/message_boards/find_message?p_l_id=18703103&messageId=83894813 2021-11-23T18:58:08Z 2021-10-15T19:56:23Z Hi from Karlovac, Croatia!<br />My students observed  two birch tree on October  4 th and 13 th. The results are the same.<br />BIrch 1.<br />All leaves:    5GY:4/8<br />Birch 2.<br /> <a href="http://1.leaf">1.leaf</a> 5GY:5/10<br />2.leaf: 5GY:6/10<br />3. and 4 leaves: 5GY: 4/8<br />Air temperature:  12C<br /><img src="https://www.globe.gov/documents/18702582/0/Birch+14.10.2021.jpg/719e18fc-f332-2e4a-5db2-b193fcbfed7a?t=1634327747143&amp;imagePreview=1" /> Snježana Marković-Zoraja 2021-10-15T19:56:23Z