Use your own words! 1. What is sea floor spreading?
2. What are the photic and aphotic zones?
3.What is latitude.. how is it determined?
4.What is longitude.. how is it determined?
5. Location of equator, prime meridian and international date line:

the mid-oceanic ridge where a divergent boundary is causing two plates to move away from one another resulting in spreading of the sea floor.the photic zone is the zone where light can be received, it's usually from 0 to 200 m deep, but this depth can be modified by the turbidity of the water. The aphotic zone is the zone where no light is received, it goes from 200 to the bottom of the sea.i dont know for the latitude and longitudeThe prime meridian separates the The prime meridian separates the eastern hemisphere from the western hemisphere

Explanation:

It is platinum in the market value