Chapter 4 Weathering

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 process that breaks down rocks and other materials on Earth's surface is called

• weathering
• erosion
• soil conservation
• decomposition

How does wind abrasion work?

• Sediment is blown off a surface from wind.
• Wind-blown sediment strikes a surface.
• Wind blows large chunks of rock off a surface.
• Sediment falls off of a surface on its own.

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.

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

Which of the following is an example of mechanical weathering?

• Acidic groundwater dissolving limestone
• frost wedging
• Paper being burned

How do plants weather rocks?

• during photosynthesis
• when roots grow into cracks of rocks and expand the rock
• when the plant moves water from the roots to the leaves

Ice wedging will

• wear down rocks as they bounce together 
• break up rocks when the water in cracks freezes and thaws
• peel away loosend material from the surface of rocks. 

Acid rain is most likely to cause...

• deposition
• glaciers to move
• chemical weathering
• mechanical weathering

What type of weathering is it when acid rain breaks down and changes the rock.

• chemical weathering 
• physical or mechanical weathering
• erosion