In your own words, explain the importance of physical geography. How does studying physical geography help humans?

What group has historically made up the largest portion of immigrants in mexico?

In a economy individuals answer the three basic and the central authority or leaders have little say in the economy.

1. crust 1 the metallic layer at the earth's center 2. inner core 3 the firm layer between the crust and the asthenosphere 3. lower mantle 2 the layer surrounding the inner core 4. asthenosphere 4 the semi-solid layer between the top layer and the upper mantle 5. upper mantle 5 the layer between the asthenosphere and lower mantle 6. top layer 6 the earth's outermost layer 7. outer core 7 the hottest part of the mantle