Ch. 11: Water

12345678910
Across
  1. 3. A large area of land that is drained by a river is known as a(n) ____________________.
  2. 6. An accumulation of pollutants at successive levels of the food chain is called _________________________.
  3. 7. A(n) ____________________ is an underground rock formation that holds water.
  4. 10. An artificial lake created by building a dam is called a(n) ____________________.
Down
  1. 1. A process by which nutrients increase in a lake while oxygen levels decrease as a result of human activity is known as ______________________________.
  2. 2. A process that removes the salt from salt water to make fresh water is called ____________________.
  3. 4. A ____________________ is a structure built across a river to control the river’s flow.
  4. 5. Water that contains waste from homes and industry is called ____________________.
  5. 8. Disease-causing bacteria, viruses, and parasitic worms that can contaminate a water supply are known as ____________________.
  6. 9. A hole that is dug or drilled to reach groundwater is called a(n) ____________________.