Pollution ppt for demo teaching
Science demo about pollution in CCSS 2
Published on: Mar 4, 2016
Transcripts - Pollution ppt for demo teaching
• Air pollution occurs when gases, dust particles, fumes (or smoke) or
odor are introduced into the atmosphere in a way that makes it
harmful to humans, animals and plants. This is because the air
becomes dirty (contaminated or unclean).
• 1. Burning Fossil Fuels
Fumes from car exhaust contain dangerous gases such as carbon
monoxide, oxides of nitrogen, hydrocarbons and particulates. On their
own, they cause great harm to people who breath them.
• Household and Farming Chemicals
Crop dusting, fumigating homes, household cleaning products or painting
supplies, over the counter insect/pest killers, fertilizer dust emit
harmful chemicals into the air and cause pollution. In many case,
when we use these chemicals at home or offices with no or little
ventilation, we may fall ill if we breathe them.
What are the effects
of air pollution?
Chemical reactions involving air pollutants can create acidic compounds which can
cause harm to vegetation and buildings. Sometimes, when an air pollutant, such as
sulfuric acid combines with the water droplets that make up clouds, the water
droplets become acidic, forming acid rain. When acid rain falls over an area, it can
kill trees and harm animals, fish, and other wildlife.
Rain can carry and deposit the Nitrogen in some pollutants on rivers and soils. This
will adversely affect the nutrients in the soil and water bodies. This can result in
algae growth in lakes and water bodies, and make conditions for other living
• Ground-level ozone:
Chemical reactions involving air pollutants create a poisonous gas ozone (O3). Gas
Ozone can affect people’s health and can damage vegetation types and some
animal life too.
• Particulate matter:
Air pollutants can be in the form of particulate matter which can be very harmful to
our health. The level of effect usually depends on the length of time of exposure, as
well the kind and concentration of chemicals and particles exposed to.
• Use energy (light, water, boiler, kettle and fire woods) wisely. This is
because lots of fossil fuels are burned to generate electricity, and so if
we can cut down the use, we will also cut down the amount of
pollution we create.
Recycle and re-use things. This will minimize the dependence of
producing new things. Remember manufacturing industries create a
lot of pollution, so if we can re-use things like shopping plastic bags,
clothing, paper and bottles, it can help.
• Encourage your family to use the bus, train or bike when commuting. If
we all do this, there will be less cars on road and less fumes.
What is Land Pollution?
• Land pollution is the deterioration (destruction) of the earth’s
land surfaces, often directly or indirectly as a result of man’s
activities and their misuse of land resources.
It occurs when waste is not disposed off properly, or can occur when
humans throw chemicals unto the soil in the form of pesticides,
insecticides and fertilizers during agricultural practices. Exploitation of
minerals (mining activities) has also contributed to the destruction of
the earth’s surface.
Sources of Land
• Agricultural sources:
These include waste matter produced by crop, animal manure, and farm residues. They also include the
chemical left over of all pesticides, fertilisers and insecticides used for agricultural activities.
Industrial sources: These include paints, chemicals, metals and aluminum, plastics and so on that are
produces in the process of manufacturing goods.
• Sewage Treatment: Wastes that are left over after sewage has been treated, biomass sludge, and settled
solids. Some of these are sent directly to landfills whiles other treatment plants burn them to generate
electricity. Both end up polluting the environment.
• Garbage or waste: These include household or municipal waste such as glass, metal, cloth, plastic,
wood, paper, and so on. Some of these can decay and others cannot. They are usually collected and sent
to landfills where the pollution action begins.
• Construction sources: These include waste like debris, wood, metals and plastics that are produced
from construction activities.
• Deforestation: This is when trees are cut down for economic purposes, mining, farming and construction.
In forests areas, trees absord and reflect about 20% of the intense heat from the sun, protecting and
preserving its surface soils. Cutting down trees mean that the land is exposed to direct sunlight and rain,
resulting in soil erosions, desertification and land degradation
• Chemical And Nuclear Plants: These include chemical waste from chemical industries that are disposed
off into landfills.
Effects of Land
• Contaminated lands and environments can:
Cause problems in the human respiratory system.
Cause problems on the skin.
Cause various kinds of cancers.
• The toxic materials that pollute the soil can get
into the human body directly by:
Coming into contact with the skin.
Being washed into water sources like reservoirs and rivers.
Eating fruits and vegetables that have been grown in polluted soil.
Breathing in polluted dust or particles.
• Dump sites and landfills also come with serious problems like
Very bad smell and odour in the town.
Landfills breed rodents like rats, mice and insects, who in-turn transmit
Landfills in towns do not attract tourists to the town. The town will loose
Many landfills are always burning and they cause further air pollution.
How to Prevent Land
• Reuse any items that you can. Items
like clothing, bottles, wrapping paper
and shopping bags can be used over
and over again, rather than buying
The greatest prevention to land
pollution is in the three ‘R's’ …
Reduce Waste, Re-use things and
Recycle things. This is true even for
governments. They can also use the
three ‘R’ rule to minimize the amount
of waste that ends up in landfills. After
the three 'R's, remember to turn the
rest of the garbage into compost.
Store all liquid
waste in spill-proof
Eat organic foods that are
grown without pesticides.
Look out for fertilizer or
pesticide free products
when you go to the market.
Don’t use pesticides
if you can.
Always throw your
trash in a garbage bin.
What is water pollution?
• Water pollution is the contamination of water bodies (e.g. lakes,
rivers, oceans, aquifers and groundwater), very often by human
Water pollution occurs when pollutants (particles, chemicals or
substances that make water contaminated) are discharged directly or
indirectly into water bodies without enough treatment to get rid of
harmful compounds. Pollutants get into water mainly by human
causes or factors.
Causes of Water
• Industrial waste
Industries cause huge water pollution with their activities. These come
Sulphur – This is a non-metallic substance that is harmful for marine life.
• Asbestos – This pollutant has cancer-causing properties. When inhaled, it
can cause illnesses such as asbestosis and some types of cancer.
• Lead and Mecury – These are metallic elements and can cause
environmental and health problems for humans and animals. It is also
poisonous. It is usually very hard to clean it up from the environment once it
get into it because it in non-biodegradable.
• Septic Tanks
Every domestic (home) toilet is connected to septic tank usually located
outside the house. Each time poop is flushed down the toilet, it goes into this
tank, where the solid part is separated from the liquid part. Biological
processes are used to break down the solids and the liquid is usually drained
out into a land drainage system. From this stage, it can escape into the soil
and nearby water bodies.
• Ocean and marine dumping
Again, think of the rubbish we all make each day. Paper waste, food waste,
plastic, rubber, metallic and aluminum waste.
Effects of Water
• Death of aquatic (water) animals
The main problem caused by water pollution is that it
kills life that depends on these water bodies. Dead
fish, crabs, birds and sea gulls, dolphins, and many
other animals often wind up on beaches, killed by
pollutants in their habitat (living environment).
Pollution disrupts the
natural food chain as well.
Pollutants such as lead and
cadmium are eaten by tiny
animals. Later, these animals
are consumed by fish and
shellfish, and the food chain
continues to be disrupted at all
Eventually, humans are affected by this process as well. People can
get diseases such as hepatitis by eating seafood that has been
poisoned. In many poor nations, there is always outbreak of cholera
and diseases as a result of poor drinking water treatment from
• Destruction of ecosystems
Ecosystems (the interaction of living things in a place, depending on
each other for life) can be severely changed or destroyed by water
pollution. Many areas are now being affected by careless human
pollution, and this pollution is coming back to hurt humans in many
• Never throw rubbish away anyhow. Always look for the correct waste
bin. If there is none around, please take it home and put it in your
trash can. This includes places like the beach, riverside and water
• Use water wisely. Do not keep the tap running when not in use. Also,
you can reduce the amount of water you use in washing and bathing.
• Do not throw chemicals, oils, paints and medicines down the sink
drain, or the toilet.
• Buy more environmentally safe cleaning liquids for the use at home
and other public places. They are less dangerous to the environment.
• 1-3. What is pollution?
• 4. Give 1 substance that cause air pollution
• 5. Give 1 substance that cause land pollution
• 6. Give 1 substance that cause water pollution
• 7-8. Give 2 ways to prevent air pollution
• 8-9. Give 2 ways to prevent water pollution
• 10. What is the effect of land pollution? Give one.
• Draw a picture of a clean
environment. It can either be water,
land or air.