Unit 5 Africa - Lesson 19

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Across
  1. 3. a geographic region with too little rainfall to support much plant life; also a vegetation zone
  2. 7. the flowing together of two or more streams
  3. 8. an artificial lake where water is stored
  4. 9. water in the form of a gas, as in steam or moisture in the atmosphere
  5. 12. a raised area of land, such as a hill or mountain, with a flat top
  6. 15. a mountainous part of a country; a climate zone where temperature and precipitation vary with latitude and elevation; a vegetation zone where the mix of plants varies with latitude and elevation; also refers to the type of vegetation in this zone
  7. 18. the electrical power that can be generated from flowing water
  8. 19. the area drained by a river and its tributaries. These tributaries are the smaller streams that flow into the main river. Rain falling anywhere in a river basin will eventually flow into the main river.
  9. 20. a system that allows for the year-round watering of crops
  10. 21. sand, mud, or clay made up of fine bits of soil and found at the bottom of a river or lake
  11. 22. solid and liquid waste from homes and other buildings that is carried away by sewers or drains
  12. 24. the movement of water from Earth’s surface into the soil
Down
  1. 1. electricity that is generated from the power of moving water
  2. 2. the layer of air that surrounds Earth
  3. 4. the stream or streams that make up the beginnings of a river
  4. 5. a series of rapids and low waterfalls on a river
  5. 6. water from rainfall that is not absorbed into the soil and instead flows into streams or lakes
  6. 10. the process by which a liquid, such as water, turns into a vapor, or gas
  7. 11. the movement of water from the surface of Earth to the atmosphere and back again. During this cycle, water evaporates from rivers, lakes, and oceans, rises and condenses into clouds, and then falls back to Earth as rain, hail, sleet, or snow. This process is also known as the hydrologic cycle.
  8. 13. the usually dry bed of a river or stream in a desert or semiarid area
  9. 14. to lose heat and change from a vapor or gas into a liquid. Moisture, or water vapor, in the air condenses to form rain.
  10. 16. the triangle-shaped deposit of sand and sediment that occurs where a river flows into an ocean
  11. 17. a stream or river that flows into a larger stream or river
  12. 23. the flat area around a river that is covered with sediment as a result of frequent flooding