1)explain some of the factors that make it difficult for geologists to learn about the precambrian era?

2)earth can be divided into three zones based on differences in incoming solar radiation. identify these zones. describe their location and general climate. also, discuss how the sun’s energy strikes each zone.

There is not much Precambrian strata preserved so it is only available to look at in certain places. 
If you are referring to life as well, very few species from pre-Cambrian. Not sure if you are asking these other questions as well but think of how the sun hits the earth based on the tilt of the earth.. and you can figure out the climate.. the areas are polar, tropical, and temperate zones. You can google planet makeup and atmospheric makeup to find that information.