Match the following.
(1) (ha) a unit of measure equal to 2.5 acres or 10,000 square meters
(2) reduced ability of the soil to support life
(3) a small tropical tree that grows in wetlands near salt water
(4) the development of higher than normal salt content in the soil
(a) land degradation
(b) hectare
(c) mangrove
(d) salinization

The difference(s) between the grand canyon and valles marineris is/are: (a) the grand canyon was formed by water, but valles marineris was not. (a) valles marineris is much longer than the grand canyon. (c) valles marineris is much wider than the grand canyon. (d) valles marineris has large volcanoes near it. all of the above

The blue segment below is a diameter of oo. what is the length of the radius of the circle?

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