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Tectonic Plates, Earthquakes, and Volcanoes
According to theory of plate tectonics, Earth is an active planet -- its surface is composed of many individual plates that move and interact, constantly changing and reshaping Earth's outer layer. Volcanoes and...
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...
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...
Solar Wind's Effect on Earth
The Sun produces 'solar wind', a continuous flow of charged particles that can affect us on Earth. It may also release huge storms of charged particles, called coronal mass ejections, that can disrupt communications,...
Monster Black Hole in Galaxy M84
Black holes are some of the strangest objects in the universe. While the physics of these objects is not understood, and they cannot be seen directly, indirect observations have revealed for certain that black holes do...
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