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

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

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

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

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

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

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

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

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

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

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

GOOD LUCK! Test tomorrow