Soil Review

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.

What is the layer of soil just below the topsoil?

• soil
• subsoil
• topsoil
• terrace farming

What is the process of rocks being broken down over time called?

• Weathering
• Accumulation
• Condensation
• Evaporation

THIS LAYER CONTAINS UNWEATHERED SOLID ROCK AND IS BENEATH ALL OTHER LAYERS......

• HORIZON A
• HORIZON O
• HORIZON D
• HORIZON C

THIS HORIZON IS MADE OF DECAYING LEAVES, TWIGS AND ANIMAL REMAINS/WASTES......

• A
• B
• C
• O

What is a good way to conserve soil?

• plant bushes

• clear all the plants to build a dirt bike track

• cut down trees

• remove all the weeds from the garden

Humus is decayed living/organic matter. It adds _______ to the soil.

• worms

• nutrients

• air

• sunlight

• smell

Soil is made of

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

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

• weathering 
• erosion

Which layer of soil are these roots growing in?

• subsoil
• topsoil