# Why Polar Seasons Are Extreme

Understand why the poles have extreme seasons — Earth's axis is tilted at about 23.5°, so as it orbits the Sun, each pole spends half the year tilted toward the Sun (continuous daylight, warmer summer) and half tilted away (continuous darkness, bitter winter); this tilt also drives the annual cycle of sea ice expanding in winter and retreating in summer, and triggers animal behaviours like migration and breeding

Builds on: Midnight Sun & Polar Night (hard, https://ai.page/c/midnight-sun-and-polar-night/en.md), Ice & States of Matter (soft, https://ai.page/c/ice-and-states-of-matter/en.md)

Concept id: why-polar-seasons-are-extreme. Subject: science. Licence: CC BY-SA 4.0.

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