What if the following geographical feature is not shared by the united states and canada?
a. the great lakes region
b. the great plains
c. the rio grande
d. the rocky mountains

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 causes heat transfer in fluids

What is one early technological advance that shaped culture? a the use of fire b the discovery of arable land c family units. d migration