Our Seasons Are All Because of a Tilt
In Our Seasons Are All Because of a Tilt, narrator Sir David Attenborough explains how our annual rhythms are caused by Earth’s tilt on its axis as it orbits the Sun. Trees blossom or shed leaves, daylight increases or decreases, and animals adapt to the changes. This video is excerpted from BBC's Planet Earth, a breathtaking documentary series that highlights the natural wonders of our planet.
Lesson Express
Q: What “constant change” happens with the seasons?
A: Trees blossom or shed leaves; less sunlight in winter; animals adapt to changing weather.
Q: What exactly causes seasonal changes?
A: As the Earth orbits the Sun, it spins on a tilted axis. The tilt causes more sunlight in summer and less sunlight in winter on much of the Earth.
Q: How do living things adapt to seasonal changes in daylight and climate?
A: Deciduous trees shed their leaves; some animals store food; some animals migrate.
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