The Moon, Earth's only natural satellite and one of the brightest objects in its sky, appears in the sky in many different shapes. Over the course of a month, the observed shapes result from the interaction of the...
This map of world seismicity illustrates earthquake data for the years 1991 through 1996. It is intended to provide a sense of the depth distribution of earthquakes. Plate boundaries are shown, along with diffuse...
This interdisciplinary learning activity illustrates the differences between the amplitude and magnitude of earthquakes in a mathematical context. Students will express earthquake magnitude as a logarithmic function of...
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...
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...
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