The greek root tropos means "mixing." why is this appropriate for earth's troposphere?
a. the air in the troposphere mixes with gas molecules from space.
b. weather and wind occur in the troposphere.
c. meteors churn the air in the troposphere as they disintegrate.
d. ozone and oxygen mix together in the troposphere.

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

Select the natural regions. delta denver forest georgia north america plateau stream

The action of eventually a low island to form. a. wind b. waves c. volcanoes d. tectonic plates