1. What Causes Seasons?

2. We know that the reason we have day and night is because the Earth
rotates.
Rotate means
to turn.
The Earth rotating on its
______
gives us day and night.
axis
Earth’s axis is
the imaginary line that goes through the center of the Earth.

3. But guess what! Rotating isn’t the only way the Earth moves in space!
The Earth also revolves.
Revolve – When one object moves around another object

4. How long does one revolution take?
It takes the Earth one year, or 365 ¼ days to orbit the sun.
Does anyone know what orbit means?
Orbit -
The path that an object follows as it revolves around another object.

5. All over the world, people experience the four seasons.

6. Winter…

7. Spring…

8. Summer…

9. and fall.

10. That tilt gives us seasons!
But why do we have four seasons?
It’s because the Earth’s axis is tilted.
Take a good look at our globe. It‘s not tilted like that because it looks nice. No way. That’s the way the Earth is tilted in space.
That tilt gives us seasons!

11. Look at this diagram. Notice how the Earth is always tilted in the same direction. As the Earth __________ the part of Earth tilted toward the sun changes.
revolves

12. During part of the year the North Pole tilts towards the sun
During part of the year the North Pole tilts towards the sun. This season is ________.
summer

13. During another part of the year, the North Pole points away from the sun. This season is ______.
winter