1. Composition of the Earth's Atmosphere
... hand, is a separate process that can be caused by increased amounts of greenhouse gases in the atmosphere. Though the major components of the atmosphere vary little today, they have changed dramatically over Earth's history, about 4.6 billion years. The early atmosphere was hardly the life-sustaining blanket of air that it is today; most geologists believe that the main constituents then were nitrogen gas and carbon dioxide, but no free oxygen ... region. Regions close to the equator receive direct rays of the sun and therefore receive more radiant energy and are warmer. 3. Ocean curren...
- Word Count: 3528
- Approx Pages: 14
- Grade Level: High School