Topic
Seasons
2 questions tagged Seasons — spanning every one of the seven Ws.
why
Why do leaves change color?
As daylight shortens in autumn, trees stop producing chlorophyll (green). Hidden pigments — yellow carotenoids and red anthocyanins — are revealed, creating the spectacular fall palette.
NatureBiologySeasons
what
What is an equinox?
An equinox is one of two moments each year, around 20 March and 22–23 September, when the Sun is directly above the equator and day and night are roughly equal everywhere.
astronomyseasonsEarth