Presentation is loading. Please wait.

Presentation is loading. Please wait.

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

Similar presentations


Presentation on theme: "Unit 7 – Resources and the Environment (Chp. 25, 26, & 27) Review for TEST."— Presentation transcript:

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 Elements (gold, copper, silver)  Fixed amounts – replaceable through process that takes hundreds of millions of years Renewable: 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

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


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

Similar presentations


Ads by Google