Current Events Bell Ringer for Grades 9–12: Why polar sea ice peaked and bottomed out in the same week
A free current events bell ringer for grades 9–12. Put the prompt on the board as students walk in, give them three to five minutes, then go over it together. The answer and teacher notes are in the box below the prompt.
The prompt
NASA reported this week that Antarctic sea ice reached its yearly maximum on September 14, 2026, covering 17.59 million square kilometers. Just two days earlier, on September 12, Arctic sea ice hit its yearly minimum of about 4.6 million square kilometers. (a) Why would one pole's ice peak in the same week the other pole's ice is at its lowest? (b) About how many times larger was the Antarctic ice extent than the Arctic's?
Answer and teacher notes
(a) The hemispheres have opposite seasons because Earth is tilted on its axis. Mid-September is the end of winter in the Southern Hemisphere, after months of cold and darkness let ice build up, and the end of summer in the Northern Hemisphere, after months of sunlight melted it back.
(b) 17.59 ÷ 4.6 ≈ 3.8 times larger. NASA noted that this year's Antarctic peak was the third-lowest maximum since satellite observations began. Good follow-up: why do scientists compare each year to a long record instead of just to last year?
Sources: NASA Earth Observatory: Antarctic Sea Ice Grows to Its 2026 Maximum; NASA Earth Observatory: Arctic Sea Ice Shrinks to Its 2026 Minimum
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