1. Unit 7 – Resources and the Environment (Chp. 25, 26, & 27)
Review for TEST

2. Earth’s Resources Distributed Unevenly
Air
Water
Land
Organisms
Rocks
Minerals
Nutrients
Geochemical cycles

3. Water Liquid Wide range of temperatures High heat-storage capacity
Dissolves many substances
Expands when it freezes

4. Natural Resources Non-Renewable: Fossil fuels
living things
surface water
Groundwater
fertile soil
Air
solar energy
elements that cycle (carbon, nitrogen)
Replaced through natural processes at same rate as being used
Non-Renewable:
Fossil fuels
Elements (gold, copper, silver)
Fixed amounts – replaceable through process that takes hundreds of millions of years

5. Land Resources Topsoil Rocks Minerals Space for humans to use: Housing
Agriculture
Roadways – use aggregates to build first layer. A mixture of gravel, sand, crushed stone

6. How humans harm resources
Poor farming practices
Air pollution by activities that disrupt the balance of geochemical cycles
Burning of fossil fuels (releases sulfur)
Mining – ore can be mined for a profit

7. Energy Resources Sun is the primary energy resource
Biomass –wood and field crop burned to use as fuel
Coal
Natural gas
petroleum

8. Air Resources The most important component of air is:
Oxygen 21%
The oxygen in Earth’s atmosphere was supplied slowly over time by photosynthetic organisms
Geochemical cycles:
Water cycle
Carbon cycle
Hydrogen cycle

9. Alternative Energy Resources
Solar energy
Hydroelectric power – energy from falling water
Geothermal energy
Nuclear energy
Biomass energy

10. Word Equations
Decreased demand for resources = reducing + reusing + recycling
Biogas = methane + carbon dioxide
Peat = remains of organisms + swamp + anaerobic conditions
Gasohol = alcohol + gasoline
Coal = peat + high temperature and pressure
Topsoil = decaying organic matter + eroded rock + minerals + nutrients + oxygen + water

11. Conservation / Population
Sustainable energy – will ensure current and future energy needs
Population will reach the carrying capacity and stop growing
Human Global Impact
Acid precipitation
Ozone depletion – ground level ozone is a major component of smog
Global warming

12. GOOD LUCK!
Test tomorrow