Galileo used his telescope to gather data about the heavens, and his observations and theories sparked much controversy. This video segment discusses Galileo's observations of sunspots, which challenged the current...
Auroras are natural atmospheric phenomena created when the solar wind interacts with Earth's magnetosphere, which means that an increase in aurora activity indicates an increase in space weather. This interactive slide...
All of Earth's living things depend on healthy, life-sustaining ecosystems for their survival. But continued human population growth, combined with the planet's limited supply of natural resources, might generate...
Glaciers are found on every continent except Australia. This interactive feature provides an introduction to these moving streams of ice, which cover about 10 percent of Earth's land surface and hold between two and...
This flow chart presents the climate classification system developed in the early 1900s by German climatologist and amateur botanist Wladimir Koppen. The system establishes six climate zones (denoted by letters)...
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