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The widths all average out the same ... 15 degrees of longitude per time zone. The shapes are drawn the way they are in order to avoid splitting cities and states into two different time zones.
There is no defining characteristic for the set. Provided they meet certain conditions, there is an infinite number of possibilities. Put the arrow of time in reverse: Take a parallelogram. Cut it up into 7 shapes. What set of shapes do you end up with? Obviously these 7 shapes can be combined to form a parallelogram. Now try different cuts. Then different parallelograms.
maybe because they are caused due to a time varying magnetic field
A project / work / topic / task which involves more time , money, labour , work can be classified as Major. The opposite of this can be Minor
Choice D.