2. 1.COAL WAS
MADE ABOUT
300 MILLIONS OF
YEARS AGO.
6.THIS PROCESS IS
CALLED
CARBONISATION.
5.UNDER HIGH
PRESSURE AND
HIGH TEMP.,DEAD
PLANTS GOT
SLOWLY
CONVERTED TO
4.THE TEMP. ALSO COAL.
ROSE AS THEY
SANK DEEPER AND
DEEPER.
2.THE EARTH HAD DENSE
FOREST IN LOW LYING
WETLAND AREAS.
3. DUE TO NATURAL
PROCESSES,LIKE
FLOODING,THESE
FOREST GOT BURIED
UNDER THE SOIL.AS
MORE SOIL
COVERED
THEM,THEY WERE
COMPRESSED.
3. Types of
Coal
Coal tar-it is
black , thick
liquid with
unpleasant
smell.
Coke- it is
tough,
porous and
black
substances.
Coal gas –it
is obtained
during the
extraction of
coke.
7. SON,MANY YEARS AGO
ORGANISMS DIED IN THE SEAS
AND DUMPED IN DEEP SEA
FLOOR AND DUE TO HIGH
PRESSURE AND TEMPAND NO
AIR THEIR BODY FLUIDS GOT
CONVERTED TO PETROLEUM.
