Tables 712-715 



TABLE 712. — Miscellaneous Geographical Data (see page 650) 



(The data on this page were compiled by R. W. Goranson, Geophysical Laboratory, 



569 



Carnegie Institution, 1930.) 



Land area, 148,847,000 km 2 ; Ocean area, 361,254,000 km 2 . 



Mean elevation land above sea-level, 825 m. 



Mean depth oceans, 3,680 m. 



Highest known mountain, Mt. Everest, India, 87 E., 28 N., 8840 meters. 



Greatest known sea-depths: Mindanao deep 10,430 meters, <io° N., 127° E.; Puerto Rico 

 deep 8,525 meters, I9°35' N., 67°43' VV. 



Thermal gradient: Not well-known; from Van Orstrand's data average is 30°C per km 

 depth but may be very different; variations observed are from 9 (Johannesburg, S. Africa) 

 to 54 (Queensland) degrees C per km depth. Max. depth measured, 2,286 m. 



TABLE 713. — Densities and Pressures of Earth's Interior 



(Below 800 km, due to Adams, Williamson.) 



TABLE 714.— Velocities of Earthquake Waves 

 V p is the velocity in km/sec. of the primary or condensational wave, V„ of the secondary 

 or distortional wave. Turner speaks of them as the push and shake waves. 



* B. Gutenberg, H. Jeffreys, K. Suda, A. and S. Mohorovicic, V. Conrad. 



TABLE 715.— Elastic Constants of Earth's Interior 



Smithsonian Tables 



