Seasons: Why They Change (Part 3)

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
revolution

Steps

Step 1 — Read

Look at the vocabulary words and write a definition for each in your own words.

Step 2 — Do

Track the moon's phase each night for two weeks. Draw what you see and identify the pattern.

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?