locks. They raise ships to the water level of the differeny body of water that will be entered. 
 
        
             
        
        
        
The key difference is that the moon is farther away for the earth during an Annular eclipse.
        
             
        
        
        
California is the point A on the map
        
             
        
        
        
Geologists can determine the actual age of features on a planet by the radiometric dating method in which the age of the rocks is calculated by the natural decay of the radioactive isotopes of elements such as carbon. 
In the radiometric dating method, the radioactive minerals in rocks are used. The radioactive isotopes, which are the chemical elements, naturally break down and decay to form a new isotope. 
Each radioactive element has a unique decay rate which is known. Hence, the radioactive isotopes are crucial for the geologist to compare and identify the age of the rocks and furthermore, the planet. 
To learn more about here isotopes here
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