soil formation

Soil is composed of all of these natural materials EXCEPT

• weathered rock
• plant matter
• plastic substances
• animal remains

The organic matter in soil comes mostly from plants. Which of the following locations would most likely produce soil with the greatest amount of organic matter?

• A desert with very high temperatures
• A prairie with lots of grasses and flowers
• A mountain with extremely cold winds
• A river with quickly moving water

Which of the following processes will most likely contribute to the development of soil?

• Volcanic eruptions that make new land
• Building up of snow in very cold areas
• Migration of animals to warmer climates
• Breaking down of rock by wind, water, and ice

Plants and animals become part of soil when they -- 

• Die and Decay
• Produce offspring
• Grow and Develop
• Take in nutrients

All of the following are plant remains EXCEPT - 

• Dead leaves
• Dried twigs
• Sand Particles
• Seed covers

The weathering of rocks into small pieces forms what natural resource?

• Minerals
• Water
• Coal
• Soil

How do plants contribute to the formation of soil? Plants - 

• cover the soil and shade it from sunlight
• die, decompose and become part of the soil
• use soil to grow and develop over time
• support the animal life in the soil

In which of the following soil layers is humus mostly found?

• A horizon

• B horizon

• C horizon

• D horizon

What is humus?

• spaces between soil particles through which water and air can move

• weathered sediment broken down by atmospheric forces on Earth’s surface

• dark, organic material formed in soil from the decayed remains of plants and animals

• a loose mixture of rock fragments, organic material, water, and air that can support the growth of vegetation

Which soil horizon typically contains the least organic matter?

• A horizon

• B horizon

• C horizon

• O horizon