Geography by Sanskriti Dubey
Geography by Sanskriti Dubey
Geography by Sanskriti Dubey
CHAPTER -2
A-1 Rocks are made up the earth’s crust. They can be very large, Like Ayer’s Rock or Uluru in Australia. They
can also be very tiny. The tiniest bits of rocks make up soil and sand . Rocks are made up of different
minerals .
A-3 The outer core is super hot with the temperature ranging between 4400°C to 5000°C . It is so hot
that the metals that is made of – iron and nickel – are in their liquid state .
A-3 Minerals have definite chemical compositions, unlike rocks .They can be made from single element or
from a combination of elements . Common minerals include quartz, feldspar, bauxite cobalt, talc and
pyrite. Gold , copper and silver are also minerals .
A-5 Difference Between oceanic crust and continental crust are as follows:-
Q-1 WHAT ARE THE DIFFERENT LAYERS OF THE EARTH? EXAM WITH THE HELP OF A
DIAGRAM.
CRUST
This is the uneven outer layer of the earth where we live. It is thinner than all the outer layers and most
solid
MANTLE
It is thicker than the crust almost 3000 km deep. It also consist silicate rocks . the mantle is rich in
magnesium and iron as well and makes up 80 per cent of our Earth’s mass.
OUTER CORE
The outer core is super hot with the temperature ranging between 4400°C to 5000°C . It is so hot that
the metals that is made of – iron and nickel – are in their liquid state. The outer core is what
creates the magnetic field and is the reason why compass on the surface of the earth always point
North. The magnetic field also acts as a protective barrier that shields the earth from the Sun’s
destructive solar winds.
INNER CORE
Inner core is rich in iron and nickel but inner is so deep that it’s under tremendous pressure. It is extremely
hot at over 5000°C.
Mantle
OUTER CORE
INNER CORE
Q-2 WHAT ARE PLATES ? WHAT ARE THE DIFFERENT WAYS IN WHICH THEY
MOVE?
A-2 Tectonic plates are the pieces of Earth's crust and topmost mantle. The tectonic plates are large
sheets of rocks that comprise the earth's surface. These plates move slowly and change their position from
time to time.
Pg-2