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Friday, June 24, 2011

Carbon Footprint Discussion

CLICK HERE to go to the web page where you will find a handout (optional) that requires students to do some thinking before discussing the diagram in class. I have students write answers on the handout as a homework assignment. The next day, I use the questions to guide our classroom discussion, randomly calling on students for their responses. It is an effective way to get students to think about how their lifestyles are related to carbon dioxide emissions. The diagram (called a "Mind Map") was provided by www.live-the-solution.com.

To view a convenient list of all the resources that have been posted on this "Earth Science Guy" blog site, CLICK HERE.

Friday, June 17, 2011

Show the True Shape of Earth's Orbit

CLICK HERE to view the Eccentricity Demonstrator. The shape of Earth's orbit around the Sun is not a perfect circle . . . BUT, it is pretty close. Unfortunately, textbooks often exaggerate the eccentricity of Earth's orbit. Use this online demonstration to let students see the true shape of our orbit, AND allow them to compare it to some of the more elliptical orbits of other objects.

Simply input the eccentricities to see the true orbital shapes. Earth is .02 (rounded), Mercury is .21, Pluto is .25, Halley's Comet is .97 (off the scale).

Because Earth's orbit is not a perfect circle, the Earth is actually about 3 million miles closer to the Sun around January 2 than it is on July 4. Keep in mind that 3 million miles is not that much, considering the average distance between the Earth and Sun is about 93 million miles.

To view a convenient list of all the resources that have been posted on this "Earth Science Guy" blog site, CLICK HERE.

Friday, June 10, 2011

Chinook Winds Explained on this 10-minute Pencast

To watch (and listen) to this Pencast, turn your volume on and then select full screen. Once the full screen appears, select Hide Preview in the lower right . . . and then play. Pencasts serve as a great review for students, and are especially helpful for students who missed class.

Click here to view the Chinook Wind Pencast (10 minutes)

To view a convenient list of all the resources that have been posted on this "Earth Science Guy" blog site, CLICK HERE.

Friday, June 3, 2011

Refraction Demonstration

I do this demonstration as I explain how the refraction of earthquake waves cause a "shadow zone". Much of what we know about the interior of the Earth has been learned from the analysis refracted earthquake waves.

To view a convenient list of all the resources that have been posted on this "Earth Science Guy" blog site, CLICK HERE.