Discuss how the concept of uniformitarianism helps explain why earth formed different density zones

Consider the last statement in the prompt: "people take such environmental factors into account in their choices when deciding where to live." do all people have a choice as to where they live? what factor plays a key role in this decision and may therefore play a large role in determining quality of life?

Which layer will become saturated first when rain falls?

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation