Question #1.

a) Describe how an electric current is generated and transported.

b) Assess the current state of national grid in the United States, as well as any challenges in updating this grid.

Question #2.

Read the article titled "Lost in Migration: Earth's Magnetic Field Overdue a Flip" located at http://www.reuters.com/article/2012/10/03/us-science-earth-magneticfield-idUSBRE8920X620121003 (Links to an external site.).

Read the article titled "Earth's Inconstant Magnetic Field" located at http://www.nasa.gov/vision/earth/lookingatearth/29dec_magneticfield.html (Links to an external site.).

a) Describe how the Earth's magnetic field is generated, and how it has changed throughout Earth's history.

b) Analyze how a magnetic reversal might impact human activities on Earth.