SOCIAL STUDIES GRADE4

Which of these will get exhausted beacause nature takes a longtime to renew them?

• forests

• animals

• coal

• soil

Which of the following sources of energy will always be available to us?

• solar energy

• petroleum

• natural gas

• coal

Forests provide us with

• Oxygen

• petroleum

• natural gas

• coal

Which of these encourages soil erosion?

• terrace farming

• afforestation

• cutting down trees

Which crop grows best in laterite soil?

• rice

• jowar and bajra

• tea and coffee

• wheat

Which of these soils is naturally very rich in humus?

• desert soil

• Mountain soil

• black soil

• red soil

------------- is a type of soil which is a mixture of clay, sand and silt.

• loam

• soil

• humus

• dirt

When plants, animals, and other organisms die, they break down and become part of the soil. What is this part of the soil called?

• clay

• sand

• humus

• silt

As plant and animal remains rot, they become humus. What does humus add to soil?

• Air

• water

• nutrients

• rock

How can you separate a mixture of sand and gravel?

• A magnet

• a sieve

• hand

• a funnel