# Changing Seasons MatchCard

The Changing Seasons MatchCard gives your students hands-on activities for the four different seasons in the different hemispheres.

# Learn About The Four Seasons

Objective: Describe how the weather changes in the two hemispheres with the different seasons.

Students match the four seasons to the diagram of the earth and sun. They need to differentiate the seasons in the northern and southern hemispheres. Your students will match the seasons with the diagram of the earth and sun

This is MatchCard #1 of the Weather Unit Study. Directions for using MatchCards are below.

## Explore the Changing Seasons

### The Earth's Revolution and Rotation

This activity is best done with a globe to represent the earth and a strong portable light source to represent the sun.

Review that the earth rotates on its own axis, and revolves around the sun. Use the globe and light source and have the students explain how the earth's rotation causes day and night.

Review that the earth revolves around the sun one time in 365 days or one year.

### The Earth's Tilt on its Axis

If the earth was sitting straight up and down there would be no changing seasons. Imagine a pencil going from the north pole through the earth and coming out of the south pole. A straight earth would have a straight pencil.

But the earth is actually tilted at a 23.5 degree angle. Demonstrate that tilt to the student.

When the North Pole is closer to the sun, the people in the northern hemisphere have summer and the people in the southern hemisphere have winter. As the earth revolves around the sun, the angle of tilt remains the same. The top of the pencil would be pointing at the same stars - or in your case at the same side of the ceiling.

As you move to the opposite side of the sun with your globe, students can see how the south pole and southern hemisphere get more sun when the northern hemisphere has the cold winter months.

Younger students may need to see this demonstration several times before it makes sense to them.

Look at the Changing Seasons Matchcard. The students can explain how the summer and winter months are opposite from looking at the diagram.

### How Big is 23.5 Degrees?

Just how big is that tilt? Use a paper plate or a paper circle (use a regular plate as a stencil) to show the earth's tilt.

Fold the paper in half and cut out the half. That is a one hundred eighty degree angle.

Fold the paper in half again to make a quarter of a pie. This is a 45 degree angle.

If you fold it in half one more time (one eighth of a circle) you would have 22.5 degrees. The 23.5 degree tilt of the earth's axis is just a little bit more than this.

Have students use their pencils to estimate a 45 degree tilt and a 22.5 degree tilt.

### Solstice and Equinox

Explain that there are two soltices a year. At that point the poles are tilting the furthest or the closest to the sun.

The date of the soltices change very slightly every year.
• June 21st is the most common date for the summer soltice for the northern hemisphere and winter soltice for the southern hemisphere.
• December 21st is the most common date for the winter soltice for the northern hemisphere and summer soltice for the southern hemisphere.
Equinox refers to the two dates when the sun is midway between the soltices.
• March 20 is the most common date for the spring soltice for the northern hemisphere and fall soltice for the southern hemisphere
• September 22 is the most common date for the fall soltice for the northern hemisphere and spring soltice for the southern hemisphere
If your globe has a stand, ask your student to place the soltice as accurately as possible to the exact point. Point out the diagrams on the Changing Seasons MatchCard and let the students place the information pieces in the correct place (download below.)

## How to Use MatchCards

Students enjoy the MatchCard with their game-like review of science concepts. Frequent review allows them to build on the knowledge they have already gained.

## Weather Unit Study

Download the complete the Weather Unit Study. Nine objectives will inform your students about weather, the weather cycle, the atmosphere, and changing conditions.

# MatchCard Science

The activities and illustrations above are from MatchCard Science, a homeschool science unit study. MatchCard Science consists of 12 unit studies which provide:
• hands-on demonstrations
• MatchCard reviews to master the material
• suggestions for science projects to complete
• instructions on a complete unit study curriculum

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