Red soil is red in colour due to the presence of large amounts of ______.
magnesium
nitrogen
iron oxide
nitric oxide
Sandy soil contains sand to about
10-15%
60-70%
70-80%
none of these
The dark coloured organic matter found in the top soil:
sand
clay
humus
black soil
Name the soil that is found in most places of Rajasthan:
Red soil
Laterite soil
Desert soil
Alluvial soil
How many types of weathering are there?
1
2
3
4
The most useful organisms in the soil are:
termiter
bacteria
earthworms
ants
Minute opening is called
ore
pore
core
sore
The natural process of breaking down of huge pieces of rocks into fine particles of soil:
Soil profile
weathering
ploughing
tilling
The top most layer of the earth is called:
Thermosphere
Lithosphere
Ozonosphere
Stratosphere
