Seasons: Why They Change (Part 2)

What You'll Learn

Earth revolves around the sun once every 365.25 days, creating a year. The tilt of Earth's axis (23.5 degrees) causes the seasons as different hemispheres receive more direct sunlight.

Key Words

orbit
rotation

Materials Needed

small ball (moon)
dark room
paper plate
markers

Safety First

Adult supervision recommended.
Do not taste any materials.
Wear safety goggles when mixing liquids.

Steps

Step 1 — Read

Read and learn: Earth revolves around the sun once every 365.25 days, creating a year. The tilt of Earth's axis (23.5 degrees) causes the seasons as different hemispheres receive more direct sunlight.

Step 2 — Do

Follow the procedure carefully, step by step.

Step 3 — Observe

Watch carefully for any changes and note the time.

Step 4 — Record

Create a data table to organize your measurements.

Check Your Understanding

Question 1

1 of 3

What causes the seasons?