Seasons are caused mainly by Earth's axial tilt, not by large changes in distance from the Sun.
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LIVE VISUAL LAB
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Interactive teaching model • relationships are controlled; scale, distance or timing may be simplified and are labeled here.
The big idea
Seasons are caused mainly by Earth's axial tilt, not by large changes in distance from the Sun.
A hemisphere tilted toward the Sun receives more direct sunlight and longer days; six months later the pattern reverses.
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HOW SCIENTISTS KNOW
Opposite seasons in the two hemispheres and measured sunlight angles support the tilt explanation.
WORDS TO OWN
seasontiltsolsticeequinox
!A COMMON WRONG MODEL
Summer happens because Earth is much closer to the Sun.
✓REBUILD IT WITH EVIDENCE
Opposite seasons occur at the same time in the two hemispheres; tilt changes sunlight angle and day length.
A scientifically true sentence can still create a false picture. This repair makes the relationship visible.
Take learning into real life
Try it together
Use a ball as Earth and a stationary flashlight as the Sun. Rotate only the ball, mark one home location and explain what changes there. Connect what you notice to why we have seasons using season and tilt.
GREEN SAFETYOrdinary low-risk activity with normal caregiver awareness.
01TALKWhat do you predict before we try it?02LOOKWhat changed? What stayed the same?03EXPLAINWhich evidence supports your idea?
Check understanding
Which statement best explains why we have seasons?
Choose the explanation that matches the evidence—not just the most familiar words.
Three things to remember
✓Seasons are caused mainly by Earth's axial tilt, not by large changes in distance from the Sun.
✓A hemisphere tilted toward the Sun receives more direct sunlight and longer days; six months later the pattern reverses.
✓Evidence matters: opposite seasons in the two hemispheres and measured sunlight angles support the tilt explanation.
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