Why do geographers spend time comparing conditions in different places and regions around the world? What is the value in making comparisons?

Geographers spend time comparing conditions in different places and regions of the world in order to compare or differentiate landforms, climates, economies, people and cultures and maybe even resources.

Explanation:

For instance, if you know that all the countries in the different continents were combined as a super continent before continental drift came into being, you would realise that certain countries in South America may have particular features or something similar to those of Australia or any other country. In can either be through the finding of fossils, landforms, etc.

Hope this helps in some way :)

radiative zone

explanation    

radiative zone is the layer of the sun which energy is transferred away from the core by radiation. although, the core is the only part of the sun that produces an appreciable amount of heat through fusion. in fact, 99% of the energy produced by the sun takes place within 24% of the sun's radius.