2 What is fuel? A fuel is a substance that provides a form of energy. Energy can be in the form of heat, light, electricity, or motion.When fuel is burned it releases energy: this is called combustion.
3 Fossil fuels Three Fossil Fuels: Coal Oil (petroleum) Natural Gas What is a fossil?Fossil fuels are the energy-rich substances formed from the remains of once living organisms.Three Fossil Fuels:CoalOil (petroleum)Natural Gas
4 Nonrenewable resources Fossil fuels are non-renewable – they are being used up faster than they are made.They take a long time to form and could run out.What are the three fossil fuels?CoalOilNatural GasQuick Review!
5 Alternative Energy Resources We need to find alternative energy resources so that we do not use up all of our nonrenewable resources
6 Renewable Resources A renewable resource is constantly being supplied. What are some renewable resources?
7 Solar Energy Solar energy – light and heat energy from the sun Solar energy is the source for wind and water energy.How?Wind – unequal heating of the Earth causes global windsWater – sun heats water for evaporation to start the water cycle
8 Wind Can be used to cause turbines to move and generate electricity The least reliable because of weather
9 Hydroelectric Power Flowing water causes the turbines to move and generate electricity.2. The most commonand most used.
10 Biomass fuels Biomass fuels are made from organic materials. Examples include:WoodLeavesFood wastesManure
11 Geothermal Energy Heat energy from underground. Magma heats up water underground
12 Protect our ResourcesYou have two minutes. Brainstorm some ways we can conserve our nonrenewable resources.
13 Energy Conservation Conservation means to save energy. Two ways to avoid fuel shortage:Find new sources of energyMake fuels available last as long as possible
14 Ways to conserve: Walk or ride bike instead of drive Put on sweater instead of turning on heatUse fans instead of air conditioningUse sunlight instead of electric lightsTurn off lights or TV when you leave the roomRecycle!
15 SummarizeWhat are the three fossil fuels and name at least one and how it is used. Explain how an alternative energy source can be used in place of…What do we call energy from the sun?
17 What is pollution? What are some forms of pollution? QuestionsWhat is pollution? What are some forms of pollution?
18 PollutionPollutants – harmful substances in the air, water, or soil.
19 Water PollutionHow would you feel if you turned on your water faucet and a stream of nice, fresh, bright green water came out?Many things can make water unsafe to drink but don’t change its color, taste, or smell.Water pollution is anything that has a harmful affect on the water or the living things in the water
20 Water Pollution What types of water can be polluted? Surface waterGround waterEven rain!Pollution can result from natural causes and human activities
21 Sources of Water Pollution The major sources of water pollution are human wastes, industrial wastes, agricultural chemicals, and runoff from roads.
23 Human Wastes Human wastes can carry bacteria that causes diseases Sewage can leak wastes into drinking waterWastes can also come from farm animalsIf you boil water it kills many disease causing organisms
24 Industrial WastesSome factories release toxic chemicals into nearby rivers and lakesMany power plants, factories, and cars pollute the air – it then falls as acid rainPouring hot water into lakes and rivers can kill living organisms
25 Water Pollution: Agricultural Chemicals Runoff from Roads Runoff from farms can carry fertilizers and pesticides that pollute waterRunoff from RoadsOil, gasoline, and salt from cars can runoff the road to pollute rivers and lakes
26 Soil Pollution Soil can become polluted by Landfills People burying hazardous wastesPolluted ground water
27 Air PollutionSome air pollution is natural (volcanoes, animals), but most is caused by humansFactories, cars, and power plants release toxins into the air which create smog and acid rain.
28 Where are we now?We have made new laws to protect our environment, but we still have a ways to go.You can do things to help keep our Earth clean*RecyclingDon’t litterConserve energy