The Earth and its Oceans 



Millions of Years 



OUGOCENE --* 



Centigra(Je-Fahrenheit 

 Conversion Table 



Fathoms, Meters, Feet Equivalents 



This revised geological time scale 

 shows age of rocks plotted against 

 cumulative thickness (after Holmes). 



A knot is a nautical measurement of speed. One knot equals one nautical mile per hour. 0.8684 knots 

 equals one statute mile per hour. 0.5396 knots equals one kilometer per hour. 



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