Which continents are most densely populated ?

Based on the information in the graph, what can you conclude about humans in the world in general?

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

Which city area has the most accessible oil reserves a) caspian sea b) siberia c)arctic coast d)lake baikal