Realizing that habitat must precede life form, what must be the sequence of "events" for the formation of today's planet earth? Is the reverse true? If so, what might be the future of the planet?

What term is given to the border between the central alps and the southern limestone alps?

Read the article titled "trans-saharan migration routes to north africa and the eu: historical roots and current trends." why do tens of thousands of sub-saharan africans try to cross the mediterranean each year? how are these refugees commonly portrayed? (site 1)

Describe the four major spheres of the earth system; identify the parts of the earth they each represent. explain what is meant by the "earth system."