EARTH,INSIDE-OUTSIDE LAYER,ROCKS -TYPES,SOIL...

1. IN SEARCH OF…
EARTH SECRETE
Presented by
SHANSON SHAJI

2. DIFFERENT LAYERS OF EARTH
CRUST
MANTLE
middle of the crust.
 UPPER MANTLE
 LOWER MANTLE
CORE
central part of the earth.
• OUTER CORE
• INNER CORE

3. LITHOSPHERE:- OUT SIDE
CRUST TOGETHER WITH HARD UPPER PART OF THE
MANTLE.
(PLATES, CRUST UNDER CONTINENTS,CUST UNDER
OCEAN)
ASTHENOSPHERE:-INSIDE
(BELOW LITHOSPHERE)
SO MUCH PREASSURE HEAT THE ROCKS
AND IT FLOW LIKE A LIQUID

4. Rocks
A rock is a naturally occurring
solid
mixture of one or more minerals,
or
organic matter
Rocks are classified by how they
are formed, their composition, and
texture
Rocks change over time through
the rock cycle

5. Igneous rock
Igneous Rocks Are Formed By
The Molten Rock Material
rising through the fissures in
the crust and solidifying either
on the surfaced of the earth or
within the crust itself.
All other rock type are formed from the
igneous rocks they are called Primary rocks

6. Granite Basalt

7. Sedimentary rocks
Rocks undergo weathering in
course of time. The scatter
pieces of remains formed will be
deposited in the lower regions as
layers. These materials gradually
transformed into sedimentary
rocks. As the sedimentary rocks are formed
in layers ,they are also known as stratified
rocks

8. Sand stone Lime stone

9. Metamorphic rocks
when rocks undergo
physical and chemical changes
due to
high temperature
and
pressure
metamorphic rocks are formed

10. seen more in Kerala

11. MARBLE SLATE

12. Weathering
Weathering is the breaking
down of rocks and other
materials on the earth’s
surface

13. Types Of Weathering
Physical/Mechanical Weather
Expansion and contraction of minerals due to variations in temperature
resulting weathering. The Physical Disintegration also occurs due to
the freezing of water in fissures of rocks

14. Chemical
weathering
Oxygen, carbon dioxide, water,
etc. react with the minerals and
result in Chemical
decomposition of rocks.
Chemical Weathering
Decomposes, Dissolves, Alters,
Or Weakens The Rock
Through Chemical Processes
To Form Residual Materials.

15. Biological Weathering
The plant roots penetrating
into the fissures into the
rock.
 Decomposition of plants and
animals remains led to
weathering.
 Human activities led to
weathering.

16. WEATHERING AND HUMANS
Minerals in rock get extracted
Helps in mining
Causes soil formation

18. Soil Evolves Soil is a natural process

19. How soil is formed ?
Answer:- The Soil We See Today Is Formed By
Prolonged Process Like Weathering Of Rocks And
Decomposition Of Organic Matter .It Is Estimated That
More Than A Thousand Years Is Required For The
Formation Of An Inch-thick Layer Of Soil

20. CLIMATE
PLANTS
&
ANIMALS
TOPOGRAPHY
PARENT ROCK
TIME
SOIL
Factors influencing soil formation

21. Different type of soil are formed due to variations in
factors such as topography and climate.
You have learned about the different types of soil in
India and in Kerala from the previous classes.
Complete the following table (Table 3.2)
INDIA KERALA

22. Without soil there won't be
any plants or animals. Soil is
one of the important factors
that makes life on the earth
possible. You know that the
green plants absorb nutrients
from the soil and prepare food
with the help of sunlight.
Humans and other animals
consume these plants. When
plants and animals die, they
return to the soil.

23. Perishing soil
Soil gets depleted due to various
human activities such as
deforestation, destruction of hills
and unscientific agricultural
activities You know that the roots
of trees hold the soil like a net.
Man is killing the soil by felling
these trees and tilling the land for
cultivating intensively without
considering the environment.

24. Let us conserve soil
Once the top soil is lost what
is left behind is barren land or
rocky surface. It will take
thousands of years for the top
soil to regenerate Top soil is
essential for the continued
sprouting of life. For this
conservation is the only
solution. By what all means
can we conserve the soil?
Discuss and find out

25. Shanson shaji