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6th Grade  Chapter 7- earth's resources
 

6th Grade Chapter 7- earth's resources

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    6th Grade  Chapter 7- earth's resources 6th Grade Chapter 7- earth's resources Presentation Transcript

    • Chapter 7 Resources
    • Natural Resources section 7-1 H.W pg 184 ques 1-4
      • A natural resource is a thing that is found in nature that living things use.
      • Some examples are vegetables that organisms use for food.
      • Trees and minerals that we use to make lumber, plastics, and metals that can be used to build houses, cds and even gasoline.
    • Renewable Natural resources
      • These natural resources are considered to be renewable resources.
      • A renewable resources are one that can be replaced by nature of by humans in a relatively short time.
      • A relatively short time is defined as one human lifetime.
      • Some examples are the Sun, water, and wind.
    • Renewable Natural resources
      • Solar energy is energy from the sun that can be used in two ways: passively or actively.
      • Solar energy is passively used when the sun heats up wind or water and that water and wind is circulated to warm the area around it.
      • We actively use solar energy by trapping the energy of the sun in what is called cells.
      • These cells trap the suns energy and turn it into electricity. They were originally created to generate electricity for satellites.
      • We can find solar cells today, in calculators, streetlights, and some experimental cars.
    • Solar cells
    • Disadvantages of Solar energy
      • Although solar energy is clean and inexhaustible, there are some downfalls of solar energy.
      • It doesn’t work well on cloudy days, and is useless at night.
      • Some systems of solar energy use batteries to store the energy for the night time, but it is difficult to store large amounts of energy in these batteries.
      • Also, these batteries could cause pollution if not discarded properly.
    • Energy from Wind
      • Wind is an excellent source of energy. For centuries we have used wind to power sail boats and ships.
      • People have even used the wind to power windmills that are used to do various things like grinding corn, pump water or creating electricity.
      • When we put a large amount of windmills in one place in order to generate electricity, it is called a wind farm.
    • Wind Farm
    • Wind Energy
      • Wind energy is nonpolluting, free and causes no waste material.
      • Some problems are: 1) There are only some places on Earth that have strong enough winds to generate electricity.
      • 2) Wind is not steady. Sometimes it doesn’t blow hard enough or it could stop entirely.
      • For a place to use wind as energy, it would have to have wind that is persistent and strong enough.
    • Energy from water
      • Running water was used to harness energy, with the use of waterwheels, in the past.
      • Today, we generate hydroelectric energy with the use of dams and turbines.
      • Dams are built to hold large amounts of water back. When some of the water is released it rushes through and forces turbines to turn and create electricity.
    • Water Energy
      • It might seem that hydroelectric energy is very environmentally safe. But is not as safe as you think.
      • The building of dams causes upstream lakes to fill with sediments and downstream lakes begin to erode.
      • Also, the land above the dam becomes flooded and wildlife in that area are heavily effected.
    • Turbines and Dams
    • Nonrenewable Resources
      • Not all natural resources are as plentiful as the sun, waster and the wind.
      • Some natural resources that we use are not able to be replaced for millions of years.
      • This causes a big problem because if we use resources faster than they can be replaced than we will eventually run out of them all together.
      • Some examples of these nonrenewable resources are oil, natural gas, and coal.
    • Nonrenewable Resources
      • When we mine for coal, oil, and natural gas, we do so in order to either burn them or use them to make other substances, in order to get energy.
      • Energy is the ability to cause change, and rely heavily on these nonrenewable resources as sources of energy for heating homes, electricity, and gasoline for our automobiles.
    • Nonrenewable Resources
      • It is very important that the world tries to find another way to create energy.
      • Its important because we only have enough coal, oil and natural gas for about the next 200 years.
      • This might seem like a long time from now, but your grandchildren and their children will be effected greatly if we don’t find a better way to produce energy.
    • People and the environment. Section 7-2 H.W. pg 194 ques. 1-4
      • People have a great impact on our environment. And its not always a good impact.
      • Every day we cut down millions of trees so we can use them for our various needs like paper production, and for the building of homes.
      • When we cut down all of these trees we are destroying ecosystems that are filled with millions of organisms.
      • When we destroy these ecosystems we could in turn destroy all of the organisms in that ecosystem.
      • What type of organisms might live in a forest ecosystem? And how would they be affected?
    • People and the environment.
      • Cutting down trees doesn’t just destroy homes of millions of organisms.
      • People, in the process of cutting down trees, could severely pollute the surrounding environment (Water, air, land), with the use of big machinery.
    • People and the environment.
      • Besides destroying trees, every time we build a new mall or a hotel, or house we are taking up space.
      • And if we continue to build on top of land like we do we are limiting the amount of space for organisms to use.
      • If we destroy a forest to build an apartment complex we force animals and other organism to go else where for shelter, and this disrupts the balance of an ecosystem greatly.
    • People and the environment.
      • To minimize this, there have been laws passed to protect the mindless destruction of habitats for our use.
      • Land must now be studied to determine how much impact construction will have on the living things in that ecosystem.
    • Landfills
      • A landfill is an area where garbage is deposited, and they effect the environment greatly.
      • Many of the things that we throw away are harmless to the environment, but some things, like batteries, paints and household cleaners that end up in landfills, leak into and pollute the surrounding soil and could eventually leak into oceans and streams.
      • These things are called pollutants, which is anything that can harm living things by interfering with their life processes.
      • If these pollutants get into water supplies and are eaten, they could cause health issues.
    • Our impact on Water
      • We know that we depend heavily on water for our life processes. We can live for 3 weeks without food but only 3 days without water.
      • Everyday activities like cleaning the kitchen floor can pollute our water supply.
      • When you mix cleaners like pinesol with water to clean the floor and then pour in down the drain in the sink when your done, you can pollute the water supply that you drink and shower with.
      • If you take it outside and pour it in the street or in the grass, it will find its way into the water supply by either getting into the soil or going down a sewer.
    • How to clean our water
      • We clean up our water by setting up water treatment plants.
      • These water treatment plants clean water by boiling it and adding harmless chemicals, like chlorine, to it to remove any impurities and harmful substances from it.
    • Our impact on Air
      • Living in New York you know that some days the air is not as clean as it should be.
      • We pollute the air in many ways. Every time we use our cars we burn gasoline which pollutes the air.
      • Every power plant that burns coal and oil to produce your electricity in your home, releases harmful fumes into the air and destroys the ozone layer.
      • These harmful fumes from the burning of gas, oil, and gasoline harms ecosystems by killing living organisms, like trees and even humans with diseases like lung cancer.
    • Cleaning the Air
      • The best way to clean the air is to cut back on pollutants we release into the air.
      • Our cars today are much more environmentally friendly than cars of the past.
      • Governments are also trying to find ways to reduce the amount of pollutants that are released into the air by factories.
    • Recycling Waste
      • Solid waste is anything that is thrown away in a solid or near solid form.
      • 80% of our waste comes from paper products. If we can cut down on our waste we can improve our environment.
      • One way to do that is to recycle, or taking a material that has been used already and change it into another form and use it again.