Soil Formation

Soil is derived from what?

• Dead organisms 

• Bedrock 

• Limestone 

• Volcanic Rock 

Weathering, such as rain, wind, and heat, fractures bedrock into smaller pieces helping it to break down to eventually form soil. 

• True 

• False

What can use the minerals available in the rocks and start to grow in the nooks and crevasses?

• Microscopic organisms such as vertebrates and nematodes.

• Microscopic organisms such as segmented worms

• Microscopic organisms such as microbes and algae.

Those microscopic organisms perform what 2 processes that help pave the way for lichen by creating organic material. 

• Oxygen and Carbon Fixation 

• Nitrogen and Oxygen Fixation 

• Carbon Dioxide and Nitrogen Fixation 

• Oxygen and Carbon Dioxide Fixation 

How does the lichen break down the rock it lives on?

• Secretion of Acid leading to chemical breakdown

• Erosion of rock leading to a physical breakdown

How long does it take for 1 cm of topsoil to form?

• 500 days 

• 25 years 

• 10,000 years 

• 500 years 

What is costing our economy 1.2 billion dollars a year through farming practices?

• Terra farming

• Soil degradation

• Climate Change

• Crop rotation

Soil connects with______________.

• the bedrock and underlining sediment layers

• the atmosphere and its biological world

• the river systems to create more soil

• the physical and biological world