class 7 ncert

1. CHAPTER-9 SOIL
MADE BY:M.Deepashikha

2. WHAT IS SOIL
Soil is also
commonly referred
to as earth or dirt;
some scientific
definitions
distinguish dirt
from soil by
restricting the
former term
specifically to
displaced soil.

3. LAYERS OF SOIL
.

4. SOIL HORIZONS
Soil is a dark brown (or
black) solid material which
is a mixture of rock
particles of various sizes
and decayed plant and
animal matter called
humus. Soil also contains
air, water and countless
living organisms. Soil is
essential for the existence
of life on the earth

5. .

6. .
.

7. Sandy soil
• Sandy soil
• Sandy Soil is light, warm, dry and tend to be
acidic and low in nutrients. Sandy soils are
often known as light soils due to their high
proportion of sand and little clay (clay weighs
more than sand).

8. .
Clay Soil
• Clay Soil is a heavy soil type that benefits from
high nutrients. Clay soils remain wet and cold
in winter and dry out in summer.

9. Loam Soil
• Loam soil is a mixture of sand, silt and clay
that are combined to avoid the negative
effects of each type

10. PROPERTIES OF SOIL
.

11. PROPERTIES OF SOIL
• The soil has the following special properties:
• Texture. The texture of the soil depends upon the
relative amount of these particles. ...
• Absorption of water. Water holding capacity in
different types of soils is different. ...
• Moisture
• Colour
• Soil pH.
• Percolation Rate
• Soil contains air.

12. THANK YOU