Soil

Humus is bad for soil.

• True
• False

Which layer of soil is on bottom?

• Topsoil
• Sand
• Bedrock

There are FOUR components of soil: water, air, organic material, and ________.

• conservation
• rock
• subsoil
• loamy

What is HUMUS made from?

• Chick-Peas
• The remains of decayed plants and animals
• Beans
• Cheese

All soils begin with what process?

• Nutrients
• Subsoil
• Weathering
• Fertile

Which of the following best describes soil erosion?

• A.  the breakdown of soil 
• A.  the improvement of soil
• A.  the addition of soil
• A.  the movement of soil by wind or water

Soil is made of

• weathered rocks and minerals
• dead plants and animals
• air and water
• all of the above

Water gets into the cracks of rock and freezes, causing the rock to break.  What is this an example of?

• erosion
• weathering

Wind blowing dirt and sand through the air is an example of...

• weathering 
• erosion

What are the four soil components?

• Sand, rock, humus, air
• Rock, humus, air, water
• Rock, humus, roots, water
• Rock, humus, animals, plants