How did the arndale centre improve Manchester ?

Determine which of the two measurements in each set is lesser.10°f or 20°ca. 10-fb. 20°c

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

Where the main factor that enabled the growth of cities and civilizations was the existence of