Soil

There are four components in soil. These include air, water, humus and one other thing. What is it?

• fertilizer
• rock fragments
• vegetation

What part do worms play in making soil?

• they break down materials into smaller pieces and tunnel through the soil
• they provide bait for fishing
• they keep pests from destroying the soil

What is humus made from?

• fragments of the parent rock
• dark, organic material from decayed remains of plants and animals
• chick peas or garbonzo beans

What determines the texture of soil?

• particle size of rock fragments
• the amount of water in the soil
• the color of the minerals

Which of these rock particles is the largest?

• clay
• silt
• sand

Where do water and air move in soil?

• in pore spaces
• in aquafirs
• in soil profiles

What is one thing that affects the chemical characteristics of soil?

• pH (how acid or alkaline the soil is)
• pore spaces
• soil structure

What does soil fertility refer to?

• the ability of the soil to grow more soil
• how well the soil supports plant growth
• how well-suited the soil is for insects

Why is erosion harmful to soil?

• There is nowhere for plants' roots to grow and absorb water.
• Nutrients are washed away.
• Both of the above are harmful to soil.

What color is the top layer of soil that contains organic material?

• yellow
• red or orange
• dark brown