Which is the most useful nutrient found in humus?
Carbon
Oxygen
Hydrogen
Nitrogen
Which is the effect of land pollution?
Various kinds of cancers
Asthma
Diarrhoea
Hypertension
Soil gets polluted by :
Dumping garbage in water bodies.
Smoke from vehicles and factories.
Chemicals getting thrown into the soil.
Burning garbage outdoors.
Very tiny living things that cannot be seen by naked eye are :
Earthworms
Microbes
Bugs
Centipedes
How is soil formed?
By breaking down of mountains.
By breaking down of hills.
By breaking down of stones.
By breaking down of rocks.
Soil is classified into :
Four
Five
Three
Two
Which is the most suitable soil for plants to grow?
Sandy soil
Clayey soil
Red soil
Loam soil
Which soil cannot hold water well?
Black soil
Which gives soil different colors?
Humus
Rocks
Silt
Gravel
The processing of wearing away of rocks is called :
Weathering
Watering
Breaking
Squeezing
