1. Water, Air, & Land Resources
Section 4.3 in textbook (pp. 108 – 112)

2. The Water Planet About 71% of Earth’s surface is covered by water.
What percent of water on the planet is usable fresh water?
Less than 1%
The Water Planet

3. Point Source Pollution: pollution that comes from a known and specific location
Example of Point Source Pollution:
Leaking landfill or storage tank
Freshwater Pollution

4. Nonpoint Source Pollution: pollution that does not have a specific point of origin
Example of Nonpoint Source Pollution:
runoff
Freshwater Pollution

5. Runoff: water that flows over the land rather than seeping into the ground
Freshwater Pollution

6. Types of Water Pollution
Disease organisms
Wastes that remove oxygen from water
Inorganic chemicals
Organic chemicals
Plant fertilizer
Sediment
Radioactive substances
Types of Water Pollution

7. Air Pollution - Ozone What is ozone? How does it help the Earth?
O3, three oxygen atoms bonded together
How does it help the Earth?
Shields Earth from 95% of the Sun’s harmful UV (ultraviolet) radiation
Air Pollution - Ozone

8. Air Pollution – Greenhouse Gases
What are they?
Carbon dioxide, methane, water vapor
Why are they necessary?
Absorb the heat that Earth emits, keeping the atmosphere warm enough to sustain life
Air Pollution – Greenhouse Gases

9. Air Pollution What is the major source of air pollution?
Fossil fuel combustion (transportation)
Air Pollution

10. Land Resources Why are mines necessary? What is a drawback of mining?
They produce many of mineral resources we need.
What is a drawback of mining?
Tears up Earth’s surface, destroys vegetation, soil erosion, create pollution
How can agriculture cause damage to land resources?
Groundwater depletion due to extensive irrigation
Land Resources