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Mount St. Helens: Before and After
When Mount St. Helens erupted on May 18, 1980, the top 400 meters (1,300 feet) of the volcano disappeared in a blast that covered more than 390 square kilometers (150 square miles) and sent thousands of tons of ash into...
Google Earth Lessons
This collection of links to lessons, tools and tips is intended for teachers who want to use Google Earth in the classroom. Resources include lesson plans, videos, virtual tours, and other multimedia features. It...
Tectonic Plates and Plate Boundaries
Continents were once thought to be static, locked tight in their positions in Earth's crust. Similarities between distant coastlines, such as those on opposite sides of the Atlantic, were thought to be the work of a...
The Sun appears to shine at a constant rate. However, its magnetic field is actually constantly changing, and this affects energy output. These variations cause effects that extend throughout the solar system. This...
Spin a Spiral Galaxy
Of the 100 billion or more galaxies visible through existing telescopes, most are either spiral or elliptical in shape and about one-fourth are irregular in shape. In addition to their shape, star systems can be further...
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