The Soils Around Us

Soil is composed of air, water, organic matter, and 

• inert matter
• nothing matters
• mineral matter

Soil exists in the pedosphere, which exists in the earth's

• atmosphere

• lithosphere

• asthenosphere

There are ______ primary ecological roles of soil. 

• 12
• 6
• 8
• 2

The following is an example of soil's role in our ecosystems. 

• Medium for plant growth
• Recycler of raw materials
• Habitat for organisms
• all answers are correct

Roughly 5% of soil is composed of 

• water
• air
• organic matter
• mineral matter

Five kingdoms of life, which all exist in the soil, include: plants, _________, fungi, protista, and_________.

• bacteria

• bioturbation

• cations

• animals

The branch of science dealing with compounds and their reactions.

• Chemistry

• Physics

• Biology

• Geology

The term organic refers to:

• Compounds primarily composed of carbon

• Compounds with little to no carbon composition

• Expensive tomatoes

• Compounds primarily composed of nitrogen

Ions which are positively charged.

• Cations

• Anions

• Pawsions

• Neutrons

This component occupies roughly 25% of soil composition.

• Air

• Water

• Mineral matter

• Organic matter