Unit 7: Land

2. the slow process of soil removal from wind and water
5. garbage juice; this is formed from the water in landfills
9. allowing too many animals to eat in an area
12. good soil gets eroded away and turned into a desert
16. chemicals used to kill insects on crops
18. cows, pigs, horses, goats, sheep, etc.
19. new farming methods were discovered in the 1940s - 1970s by Norman Borlaug
23. farming fish, clams, algae, etc.
24. when you don't get all of the necessary vitamins and amino acids from foods
25. either feces or chemicals that contains nitrogen and phosphorus to be put onto crops
26. trash that is nuclear, biological, or chemical is _________ waste

1. roads and buildings retain more heat than the surrounding environment
3. accumulation of salts in the soil
4. a material can be broken down in the environment
6. the surface layer of soil that has more nutrients
7. land that has few people and large open spaces
8. a place where we put all of our garbage
10. a kind of food that is non-genetically modified and was not grown with chemical fertilizer
11. when trees are removed en masse
13. roads, bridges, power lines, waste pipes
14. a method of removing hazardous waste where we pump it underground and seal it with concrete
15. potato plants produce a ton of food per plant, therefore they have a high _____.
17. humans have done this to sheep, cows, corn, etc. in order to make them more useful to us
20. to get the raw materials from trash and use them to make new things
21. land that is mostly covered with buildings and roads; city
22. widespread starvation caused by foot shortage