30how does using natural resources affect the environment?
TRANSCRIPT
How does using natural resources affect the environment?
CHAPTER 6: LESSON 3:
ResourceIs a material found in nature and
used by living things.
Example:1) Plants2) Animals (for food)3) Air4) Water (from lakes, rivers and
underground)5) Rocks6) Oil (underground)7) Salt
Resources can be divided into 3 types.
Renewable resources
Reusable resources
Non-Renewable resourcesAre resources
that can be replaced during
a human life.Example:
PlantsAnimals
Sun’s energy
Are resources that cannot be replaced during
a human life.Example:
CoalSoil
Metals
Are resources that can be used
over and over again.
Example:Air
Water
Renewable resources
Non-renewable resources
Coal Petrol
Soil- Soil is a very important resource.- Without soil plants will not grow.- Many animals wouldn’t have places to live.
Soil is a mixture of many things.
Water Air
Tiny pieces of rock
Humus
PART OF SOIL THAT IS MADE UP OF PARTS
OF DEAD PLANTS AND
ANIMALS.
Humus
Types of soil -Soil can have
different colors. -Soil can have
different sizes of rocks (grains)
Clay soil Silt soil Sand soil
Types of soil
Properties
Size of particles
Sticky Smooth Gritty (coarse)Feel
(When wet)
Not much air space Some air space Lots of air space Air space
Does not pass(Stays wet) Stays a while
Passes fast(Dry fast) Water
Is a mixture of sand soil, silt soil, clay soil and humus.
Loam soil
Loam soil is the best soil for growing crops.
Solid, natural material formed from non-living things.
Minerals
Gold Diamond Graphite
Example:
Examples of some minerals and their uses
are:a) Diamond
- It is very hard (used to cut steel)
- Used for jewelry.
b) Gold
- Used for jewelry (shiny).
c) Graphite
- It is dull, dark and soft.- Used in pencils for writing.
d) Quartz
- Used to make glass.
e) Hematite
- Used to make iron used in buildings.
f) Halite
- To make salt for food.
g) Copper
- To make electrical wires.
In nature
Minerals can be found:
Ex. Iron can be found in a rock called ore.
But:Steel is combination of iron
and carbon (made by people)
So, it is not a mineral
Properties of minerals
1) Colour
3) hardnes
s
4) Luster
2) Streak
1 )Colour(Not a good way to identify minerals
because some minerals have different colors.
Example: QuartzCan be pink, purple, white, clear or
even black )
2 )StreakColor of the powder left behind when a
mineral is rubbed against a rough surface
3 )Hardness
(Mohs scale)Copper
Talc Quartz Diamond
4 )Luster(The way the mineral reflects light
from its surface)
Luster can be 2 types.
Metallic luster(Shiny)
Non-Metallic luster
(Dull)
Metallic luster(Shiny)
Non-Metallic luster
Rocks are put into groups according to how they are
formed (made)
Types of rocks
1) Igneous rocks
2) Sedimenta
ryrocks
3) Metamorphi
c rocks
Igneous rocks2- Formed when rocks melt and then cool.
1) Sedimentary rocks are pushed under the earth crust where heat and pressure turns them to magma.
2) Magma comes out of a volcano and cools to form Igneous rocks.
IfIgneous rocks cool
down quickly
Look like glassExample:Obsidian
Igneous rocks cools down slowly
Has large grainsExample:
Granite
Sedimentary rocks
1
- Formed when materials settle into layers. Example:
Sandstone Limestone
Wind and water break the rocks into small pieces.
Wind and water carries bits of rock and soil
away.
Bits of rock and soil settle into layers.
After a long time, layers harden into rocks.
Metamorphic rocks
3- Rocks formed due to high pressure and temperature.
Uses of some rocks1) Slate
- Rocks formed due to high pressure and temperature.
- Used for making roofing tiles as it splits easily in to thin sheets.
2) Marble
• Rocks formed due to high pressure and temperature.
• Used for making floor tiles and status are also made from marble as they have attractive colour and texture.
3) Granite
• Igneous rock .• Used for making steps and in building
schools as it is hard and impermeable so does not wear away easily.
4) Chalk
• Sedimentary rock .• Made from skeletons of tiny sea animals ,it
wears away easily so they are used to write on blackboards.
What causes an ecosystem (environment) to change?
Natural events People
Natural events
volcano
Natural events
Natural events
Hurricane
Natural events
Hurricane damages
Natural events
Drought
Natural events
Earthquake
Natural events
Earthquake
Natural events
Tsunami
Natural events
Swarms of locust
Natural events
Volcano Earthquake
Drought
Hurricane
Locust
Tsunami
What causes an ecosystem (environment)
to change?
Natural events People
People
Cutting down forests
Deforestation
People
Over population
When too many people live in an area
How many years does the oil takes to be formed?
Millions of years
Where is the oil found?Under the sea and under the
ground
People
Oil - slick
It harms birds, fish and other animals in the sea
People
Adding harmful things to the air, water or land
Pollution
Pollution
Cars and factories gives off gases which is harmful to breathe
Air pollution
Pollution
Dump wastes from homes and factories into ocean, lakes and rivers. Polluted
water kill plants and animals, they make people sick.
Water pollution
Pollution
Throw trash on the ground ( litter )
Land pollution
Resource pack page 107
What happens when ecosystem
change?Accommodation
Is the response to a change
What happens when ecosystem
change?Moving away
Not all animals accommodate ecosystem changes. Some must find new places to live in to find food, water and shelter.
What happens when ecosystem
change?Extinction
If an organism does not find its need after ecosystem changes, it will die. Sometimes a species can slowly disappear and
become extinct.
ConservationSaving resources by using them wisely
Reduce
Turn off the lights when you do not need them
Turn off TV when not watching it
Write on both sides of sheet
Close tap ( faucet ) while brushing teeth
Fix leaky toilets and faucet
Ride bike instead of a car
Use less of something
Reuse
Wash glass bottles and reuse them
Donate clothes and books so that other people uses them
Reuse old clothes as cleaning rags
Use plastic shopping bags as garbage bin
Buy rechargeable batteries to use
Use something again
Recycle
Recycle paper, plastic, glass and metal
Recycle paper to make newspaper, cards.
New product from old materials