<span>It's more accurate than scale diagrams. 
You don't need tools (graph paper, protractor etc) 
Also, if you are using computers, it easy to programmme.</span><span>
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The Indian Ocean. 
The rest of your options are not oceans, they are bodies of water. (e.g: lakes,rivers,gulfs) 
        
                    
             
        
        
        
B
Assume north and east as two sides of a right angled triangle. magnitude of the distance is then given by the length of the hypotenuse which is 
where a = 1.2 km north
and b = 1.6 km east
magnitude = 2 km
Direction is given by the angle between them, that is atan(a/b) = 36.86 deg north of east = 53.1 deg east of north.
 
        
             
        
        
        
The period of the wave is the reciprocal of its frequency.
       1 / (5 per second)  =  0.2 second .
The wavelength is irrelevant to the period.  But since you 
gave it to us, we can also calculate the speed of the wave.
Wave speed = (frequency) x (wavelength) 
                   = (5 per second) x (1cm)  =  5 cm per second
        
             
        
        
        
a). Perihelion . . . the point in Earth's orbit that's closest to the Sun.
                            We pass it every year early in January.  
b). Aphelion . . . the point in Earth's orbit that's farthest from the Sun.
                          We pass it every year early in July.  
c). Proxihelion . . . a made-up, meaningless word
d). Equinox . . . the points on the map of the stars where the Sun 
                         appears to be on March 21 and September 21.