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"Of all the regions on earth none invites more speculation than that which lies beneath our feet, and in none is speculation more dangerous."|
Richard Dixon Oldham, 1906
In the year's since Mr. Oldham made his statement great strides have been made toward a greater understanding of the compostion of the layers of the Earth's inside, activity that occurs within (and between) such layers and how each affects the Earth's surface. Maps of the Earth's crust, core and mantle (like the image above) have been created as a result of more advanced technology and an increase in the amount of available data.
The movement of tectonic plates causes earthquakes. Seismic waves are sent out when such an event occurs. Using seismic wave data collected at seismic stations across the globe, geophysicists learned much about the Earth's inside. Enough to create colorful, informative, detailed maps of the region beneath our feet.