1) How do Scientist classify the Earth's Major Physical Characteristics?

Scientists separate the earth between the inner layers and outer layers. And the outer layers are separated into "spheres."

Explanation:

The scientist's basic considerations are to identify, describe and classify all the characteristics of the Earth, to generate hypotheses to justify its existence and growth, and to devise ways of testing the relative validity of competing opinions. Thus the most realistic, appropriate, and lasting ideas will be created. Earth is a big planet and so doesthe environment around it. Scienticist classify the planet into different spheres to make it study more efficient by using scitific methods deplyed at each sphere.

landlessness of ordinary people

^^something like that^^^