Water, Air, & Land Resources Section 4.3 in textbook (pp. 108 – 112)
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Water, Air, & Land Resources Section 4.3 in textbook (pp. 108 – 112)
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Transcript of Water, Air, & Land Resources Section 4.3 in textbook (pp. 108 – 112)
Water, Air, & Land Resources
Section 4.3 in textbook (pp. 108 – 112)
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%
Freshwater Pollution
Point Source Pollution: pollution that comes from a known and specific location◦Example of Point Source Pollution:
Leaking landfill or storage tank
Freshwater Pollution
Nonpoint Source Pollution: pollution that does not have a specific point of origin
Example of Nonpoint Source Pollution:◦runoff
Freshwater Pollution
Runoff: water that flows over the land rather than seeping into the ground
Types of Water Pollution
Disease organismsWastes that remove oxygen from waterInorganic chemicalsOrganic chemicalsPlant fertilizerSedimentRadioactive substances
Air Pollution - Ozone
What is ozone?◦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 – 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
What is the major source of air pollution?◦Fossil fuel combustion (transportation)
Land Resources
Why are mines necessary?◦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
