What is the composition and structure of the Earth's atmosphere? Why is

it as warm as it is, and how did it form? Today I will describe the

composition and structure of the atmosphere, the Greenhouse Effect, the

Primordial Atmosphere, and Atmospheric Evolution. The Earth's

atmosphere is a complex, dynamic, and evolving system, and we will use

it as a point of comparison when we begin to examine other planetary

atmospheres in future lectures. Recorded 2007 Oct 31 in 1000 McPherson

Lab on the Columbus campus of The Ohio State University.