SAN FRANCISCO --- Over the last two decades, scientists have generated many pictures of Earth's interior by mapping the behavior of seismic waves, those waves of energy that shake the ground during earthquakes. These seismic images show some areas where waves travel faster than average and some where they travel more slowly through the mantle---a plastic-like layer between Earth's crust and core that flows under pressure, lifting or lowering features on the surface.
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University Of Michigan. "Interpreting Images Of Earth's Interior." ScienceDaily. ScienceDaily, 15 December 1999. <www.sciencedaily.com/releases/1999/12/991214113030.htm>.
University Of Michigan. (1999, December 15). Interpreting Images Of Earth's Interior. ScienceDaily. Retrieved March 9, 2014 from www.sciencedaily.com/releases/1999/12/991214113030.htm
University Of Michigan. "Interpreting Images Of Earth's Interior." ScienceDaily. www.sciencedaily.com/releases/1999/12/991214113030.htm (accessed March 9, 2014).