About of the population of the us and canada lives in urban areas. a. 80% b. 60% c. 40% d. 20%

Wegeners theory of continental drift states that the continents have changed throughout history while the theory of plate tectonics

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

What factors contribute to american farming success?