Weathering and Soils: Soil

The video tutorial explains the significance of soil for living organisms, detailing its composition, including rock fragments, air, water, and organic matter. It highlights the process of weathering and the role of humus in providing nutrients and retaining water. The tutorial also covers soil structure, texture, and the importance of air spaces for plant growth.

What is soil primarily composed of?

• Just air and water

• Only decomposed plants

• A mixture of rock, air, water, and organic material

• Only rock fragments

Why is humus important for soil?

• It removes air from the soil

• It provides nutrients and helps retain water

• It makes the soil sandy

• It makes the soil dry

What is the role of pore spaces in soil?

• They hold water and gases essential for plants

• They are empty spaces

• They are filled with rocks

• They store only air

Which of the following describes a sandy soil texture?

• Made mostly of water

• Made mostly of humus

• Made mostly of sand

• Made mostly of clay

What type of organisms might you find living in soil?

• Fish and birds

• Bacteria, insects, and worms

• Only plants

• Only mammals