Difference between erosion and mass movement

Can someone me? i need to have this done as soon as possible! i'm putting 20 points on this!

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

What are two australian geographical features that hindered early exploration? western plateau gulf of carpentaria great barrier reef great dividing range