What line of longitude forms the other side of the prime meridian

The meridian directly opposite the Prime one ... roughly down the middle of the Pacific Ocean ... is the meridian of 180° longitude, both East and West.

Technically, it should also be the International Date Line, but it's not.  The International Date Line has been defined with several kinked segments in it, in order to avoid having it cut through the few islands that lie along 180°.  

If it were allowed to do that, there would be nations that would have two different calendar dates on the same island.  Kids who live on one side and go to school on the other side would constantly be either cutting school or showing up on Saturday, and people would be missing their dental appointments on the other side.  Much easier just to put a kink in the International Date Line so that whole country is on the same calendar date.

a electromagnetic waves

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.