Upload
reem-bakr
View
112
Download
1
Tags:
Embed Size (px)
Citation preview
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:Plants
AnimalsSun’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:
AirWater
Soil- Soil is a very important resource.- Without soil plants will not grow.- Many animals wouldn’t have
places to live.
Clay soilSilt soilSand soil
Types of soil
Properties
Size of particles
StickySmoothGritty (coarse)Feel
(When wet)
Not much air space
Some air spaceLots of air spaceAir space
Does not pass(Stays wet)
Stays a whilePasses 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.
Examples of some minerals
and their uses are:
a) Diamond
- It is very hard (used to cut steel)
- Used for jewelry.
1) Colour(Not a good way to identify minerals
because some minerals have different
colors.
Example: Quartz
Can be pink, purple, white, clear or even
black)
4) Luster(The way the mineral reflects light
from its surface)
Luster can be 2
types.
Metallic luster
(Shiny)
Non-Metallic
luster
(Dull)
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.
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.
If
Igneous rocks cool
down quickly
Look like glass
Example:Obsidian
Igneous rocks cools
down slowly
Has large grains
Example:Granite
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
Pollution
Dump wastes from homes and factories into ocean, lakes and rivers. Polluted water kill plants and
animals, they make people sick.
Water pollution
Moving away
Not all animals accommodate ecosystem changes. Some must find new places to live in to find food, water and shelter.
Extinction
If an organism does not find its need after ecosystem changes, it will die. Sometimes a species can slowly disappear and
become extinct.
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