Understanding Soil: The Science Beneath Our Feet

What is the scientific term for the top layer that covers most of the land?

• Soil

• Sediment

• Mantle

• Crust

Which component of soil is primarily responsible for its ability to retain water?

• Water

• Minerals

• Organic matter

• Air

What role do earthworms play in the soil ecosystem?

• They pollinate plants

• They create tunnels for air and water

• They consume minerals

• They produce soil

Which of the following is NOT a component of soil?

• Minerals

• Plants

• Air

• Water

What is 'humus'?

• A synthetic fertilizer

• A type of mineral

• A layer of solid rock

• Nutrient-rich part of the soil

What is the primary function of bacteria in the soil?

• To aerate the soil

• To increase soil temperature

• To decompose organic matter

• To solidify the soil

Which of the following is a living component of soil?

• Air

• Water

• Organic matter

• Sand

What gives soil its dark brown color?

• Rocks

• Humus

• Clay

• Sand

Which layer of soil is closest to the surface and rich in humus?

• Bedrock

• Subsoil

• Parent material

• Topsoil

What happens as you move deeper into the soil layers?

• Increase in organic matter

• Decrease in minerals

• Increase in minerals

• Decrease in water content