ENVIRONMENTAL BALANCE

                            ENVIRONMENTAL BALANCE





Q 1    FILL IN THE BLANKS BY SELECTING THE CORRECT ALTERNATIVE FROM THE
         BRACKETS
                                                                                                                                                                     (LAND, AIR, WATER, ACID, ABIOTIC, ICE, COAL, GLOBAL, OZONE, CONSERVATION, CATALYTIC CONVERTER,  HARVESTING , BURNING, )

1  ....................... POLLUTION CAUSES BREATHING PROBLEMS.

2. BURNING OF FUEL AND CUTTING DOWN TREES INCREASES THE GAS          ........................................... IN THE AIR.THIS MAY LEAD TO .......................... WARMING,  WHICH MAY CAUSE MELTING OF ...................... NEAR THE POLES. AS A RESULT, THE LEVELS  OF ..................... IN THE OCEANS MAY INCREASE AND ......................... NEAR THE  OCEANS MAY GET SUBMERGED IN WATER.

3. HARMFUL GASES GIVEN OUT IN .................................. PLANTS, WHERE ELETRICITY IS    MADE BY BURNING ........................... , MIXES WITH WATER DROPS IN THE CLOUDS. THIS CAN RESULT IN ........................ RAIN.

4. THE GAS ......................................... PRESENT IN THE UPPER ATMOSPHERE PROTECTS  US FROM HARMFUL RAYS OF THE SUN BY ABSORBING THEM .....................................    POLLUTION IS REMOVING THIS GAS FROM THE ATMOSPHERE.

5. DRINKING WATER POLLUTED BY SEWAGE CAN CAUSE DANGEROUS DISEASES  SUCH AS ................................... OR .......................................

6. POISONOUS CHEMICALS RELEASED IN WATER FROM ................................. AFFECTS  FISH AND WATER ANIMALS AND PLANTS. WE CAN FALL ILL IF WE EAT THEM.

7. SUBSTANCE SUCH AS PLASTIC IN GARBAGE DO NOT ROT. THEY PERMANENTLY  STAY IN THE SOIL  AND POLLUTE IT. SUCH SUBSTANCES ARE KNOWN AS NON  ........................................... SUBSTANCES.

8. AIR,WATER AND SOIL ARE ....................................... RESOURCES.

9. PROTECTING SOIL FROM EROSION AND POLLUTION IS CALLED SOIL ....................................................

10.WATER .......................................... IS A METHOD OF CONSERVING GROUNDWATER.

                                                                                                                                         

EARTH & ITS LIVING WORLD

 Q1  FILL IN THE BLANKS
1) A VAST  STRETCH OF LAND IS CALLED A  ---------------..
2)  ---------WATER IS SALTY.
3) THE LAND ALONG THE MARGINS  OF THE OCEAN IS CALLED THE ---------REGION
4)  HUGE BLOCK OF ICE FLOATING IN THE SEA ARE CALLED  ---------.
5)  OZONE LAYER ABSORB THE HARMFUL ----------RAYS OF THE SUN.


Q2  CHOOSE THE CORRECT OPTIONS FROM THE  BRACKET .

1) ZEBRAS ARE FOUND IN  --------------(AMERICA , AUSTRALIA , AFRICA).

2) A CASCADING RIVER IS CALLED A  ---------(TRIBUTARY ,RIVERLET, WATERFALL)

3)WEATHER RELATED PHENOMENA ARE SEEN IN THE  -------- OF THE ATMOSPHERE
    (IONOSPHERE , TROPOSPHERE, STRATOSPHERE )

4) ROCKS FORM A PART OF THE ---------------(HYDROSPHERE , LITHOSPHERE,ATMOSPHERE )
 
5)-----------IS THE LARGEST CONTINENT .(AFRICA , ASIA EUROPE )

Q3) MATCH  THE COLUMNS

                        A                                                      B

1)  CLIFF                                                      a)  RIVERS

2)  ATLANTIC                                              b)  ICE

3)  TRIBUTARY                                            c) GROUND WATER

4)  LAYERS OF SNOW                                d)  OCEAN

5)  WELL                                                       e)  LANDFORM

Q4 ) WATER CYCLE

LESSON 10: SOME PROPERTIES OF SUBSTANCES SMITA

               LESSON 10 : SOME PROPERTIES OF SUBSTANCES          

Q1 Which substances are said to be good conductor of heat  &electricity ?

A   Some substances have the capacity to conduct or carry heat  & electricity.Such substances are called good conductors of heat & electricity.For example copper ,gold ,silver,iron and aluminium are good cnductors of heat  & electricity.


Q2 Which substances are said to be bad conductors of heat & electricity ?

A   Some substances do not have the capacity to conduct or carry heat & electricity. Such substances are called bad conductors of heat & electricity.For example plastic,rubber,wood,paper,acrylic and cloth are bad conductors of heat & electricity.

Q3 What are magnetic substances ?

A  Substances which are attracted to a magnet are called Magnetic substances. for e.g nickel,iron and cobalt are magnetic.

Q4What are Non-magnetic substances ?

A Substances which are not attracted to a magnet are called Non-Magnetic substances. for e.g sawdust,copper,zinc ,gold,silver   & ,aluminium are Non-Magnetic.

Q5 Give the uses of magnets ?

A  1)Motors,generators and loudspeakers have powerful magnets.
     2)In srap yards magnet are used to separate iron & steel from the junk.
     3)Hard disks,floppies,audio video tapes are also coated with magnetic materials.
     4)Information is stored on magnetic strips in credit cards & airline tickets.
Motors, generators

lesson 1

welcome