Answer
The interactions makes the changing over time
Explanation
It the interactions that change the earth spheres over time. First earth consisted of the carbon dioxide which got interactions with the microorganisms and plants, the atmosphere was also filled with oxygen to support other interactions. As the earth takes thousands of years, the erosion of soil through wind, water or glacier also played the role to change the spheres. The storms get interacted with the birds and tree and affected them badly. Humans on the earth were also affected by these changing process.
