(needed ! )based upon the mechanics of mantle convection, which feature will most likely be formed at the blue arrow, and through which mechanism?
a. an island arc will be formed by ridge push.
b. a rift valley will be formed by subduction.
c. an ocean trench will be formed by slab pull.
d. a mid-ocean ridge will be formed by ridge push.

Match your vocabulary word to its definition. 1. emigration 2. immigration 3. migration 4. overpopulation 5. sustainable development 6. under population 7. unsustainable development 8. urbanization the movement from one place to another the number of people exceeds the available natural resources in an area leaving one's homeland to settle in a new place the increase in the population of a city the movement of people to a new country the ability to meet current needs without reducing the ability to meet future needs resources being used up at a faster rate than they can be replenished birth rate insufficient to replace the existing population