Lecture 19

Question 1

What percentage of earths surface is covered in water

Answer 1

71%

Question 2

What percentage of earths water is freshwater

Answer 2

2.6%

Question 3

Where is most freshwater found?

Answer 3

Trapped underground, or frozen in glaciers/icecaps

Question 4

Define Drainage basin/Watershed

Answer 4

The area from which a larger body of water fills through surface runoff

Question 5

Define zone of aeration

Answer 5

area beneath the surface where spaces are partially filled with water

Question 6

Define Zone of saturation

Answer 6

are beneath the surface where spaces are completely filled with water

Question 7

Define Aquifer

Answer 7

underground layer of rock that holds groundwater

Question 8

List the Advantages of Dams/Reservoirs

Answer 8

• Helps control floods
• Can be used to generate electricity
• Large supply of water for irrigation

Question 9

List the disadvantages of Dams/Reservoirs

Answer 9

• Diverted water can cause floods

- Can disrupt natural migration and spawning grounds

Question 10

Define desalination

Answer 10

The process through which dissolved salts are removed from water sources to produce fresh water

Question 11

List the types of irrigation used in agriculture

Answer 11

Flood irrigation (most wasteful), center pivot, drip irrigation, and gravity flow