How is the formation of grike similar to the formation of a swallow hole

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 is the border between layers a through f and layer g called?

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