Composition and formation of soil (B- 18,Ln 1)

What do plant roots absorb from the soil?

• Carbon dioxide

• Oxygen

• Nitrogen

• Hydrogen

How does soil help plants stay upright?

• By providing nutrients

• By fixing them in the ground

• By absorbing sunlight

• By producing oxygen

What do earthworms take in from the soil?

• Carbon dioxide

• Water and oxygen

• Nitrogen and hydrogen

• Sunlight

Why do prairie dogs make burrows in soil?

• To find food

• To stay warm and moist

• To avoid predators

• To store water

What is one use of soil for humans?

• Building bridges

• Making clay pots

• Generating electricity

• Producing plastic

What is soil made up of?

• Only rocks

• Only organic matter

• Small particles of rock, organic matter, minerals, air, and water

• Only minerals

What is the process of soil formation called?

• Erosion

• Weathering

• Sedimentation

• Deposition

What acts on rocks to form soil?

• Sunlight

• Heat, cold, rain, wind, and snow

• Earthquakes

• Volcanic eruptions

What begins to form at the top of the soil during its formation?

• Rocks

• Organic matter

• Sand

• Gravel

What is the role of soil in construction?

• It acts as a base for buildings and roads

• It provides insulation

• It generates electricity

• It absorbs sound