Soil

How does freezing water cause the weathering of rocks?  The freezing water—

• keeps the rocks in place
• makes the rocks last longer
• expands cracks and breaks rocks
• causes rocks to fall in landslides

The diagrams  shows a natural process that weathers rock.
 Which statement best explains why this process results in weathering?

• frozen water acts as a solute
• water expands when it freezes
• the mass of water increases when it freezes
• frozen water dissolves most types of rock

What is mechanical weathering?

• Process through which rocks are physically broken into smaller pieces.
• Rocks are broken down through chemical changes.
• Rocks are worn away from acid in plant roots.
• Rocks broken down by machinery.

What are the two factors that affect the rate at which weathering occurs?

• climate and mass of rock
• climate and size of rock
• type of rock and size of rock
• type of rock and climate

decayed organic matter in soil

• abrasion
• exfoliation
• humus
• erosion

a soil layer with physical and chemical properties that differ from those soil layers above and below it

• soil profile
• soil horizon
• humus
• deposition

the soil horizon in a specific location; a cross section of soil layers that display all soil layers

• soil profile
• soil horizon
• humus
• deposition 

What is the name of Soil Horizon O?

• Bedrock
• Topsoil
• Organic Layer
• Subsoil

What is the name of Soil Horizon B?

• Subsoil
• Topsoil
• Bedrock
• Transition Zone

What are the two types of weathering?

• Rain and Snow
• Precipitation and Temperature
• Physical and Chemical
• Metal and Nonmetal