Unit 5

1. A tropical cyclone with sustained winds of 74 miles per hour or higher.
8. Rotation The practice of growing different crops in succession to preserve soil health.
10. Geography The study of the spatial relationships between humans and the natural world.
12. Chlorofluorocarbons.
13. A sudden and violent shaking of the ground.
14. Farming A system of agriculture involving large-scale farms.
17. A severe shortage of food, often leading to widespread hunger.
18. The ability to meet the needs of the present without compromising the ability of future generations to meet their own needs.
19. Ring of Fire A region around the Pacific Ocean known for its high frequency of earthquakes and volcanic eruptions.
21. A method of extracting oil and natural gas from shale rock.
24. The process of transforming a society from agrarian to industrial.
26. Gasses Gases that trap heat in the Earth's atmosphere.
27. Mining A method of mining involving the removal of a layer of earth to extract resources.

2. The artificial application of water to land.
3. A very large and powerful storm.
4. Warming The long-term heating of Earth's climate system.
5. Erosion The wearing away of the topsoil by wind, water, or other natural agents.
6. Building The construction of barriers to control the flow of water.
7. The process by which fertile land becomes desert.
9. Resources Resources that can be replenished naturally.
11. A large wave caused by an underwater earthquake or volcanic eruption.
15. Rain Precipitation that is unusually acidic due to atmospheric pollution.
16. The depletion of fish populations due to excessive fishing.
20. A prolonged period of abnormally low rainfall.
22. Genetically modified organisms.
23. Layer A layer in the Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation.
25. Agricultural Revolution The transition from hunting and gathering to sedentary agriculture.