Which of the following is NOT one of the three layers of soil?

• topsoil
• undersoil
• subsoil
• bedrock

Which layer of soil is on the top?

• topsoil
• subsoil
• bedrock
• dirt

What layer of soil is in the middle?

• topsoil
• bedrock
• minerals
• subsoil

Humus is.....

• the dead parts of plants and animals in soil.
• A food we eat with pretzels.
• The tiny particles inside of soil
• The roots that come off of a plant and live in soil.

Ellen grabs a topsoil sample in her hand. She rolls it into a ball. The soil feels gritty and the ball falls apart. What part of the topsoil most likely made the topsoil feel gritty?

• clay
• sand
• silt
• humus

Which of the following is the largest particle in soil?

• sand
• silt
• humus
• clay

The texture of soil depends mainly on

• the types of plants that grow in the soil.
• the size of the particles in the soil.
• the color of the soil.
• the number of worms in the soil.

You dig a small hole in the soil and the next day it rains. The hole fills with water, but does not empty even after several days of dry weather. What is the soil mostly made of?

• clay
• sand
• humus
• silt

Soil is made of

• Weathered rock
• decomposed plants and animals
• air and water
• all of the above

What are the three soil particles that we use to classify soils?

• sand, dirt, and soil
• clay, sand, and silt
• silt, loam, and sandy loam
• clay, salt, and pebbles