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

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.

Once feature of Karst topography is limestone soil bedrock which can be dissolved by the acid rain resulting from carbon dioxide in rain.  What is another feature of Karst topography

• pollution in artesian wells
• superalkaline precipitation
• sinkholes caused by cave roofs collapsing
• an elevated water table

Caves being formed by carbonic acid in rain dissolving underground limestone, such as occurs in the Valley and Ridge region of Virginia is an example of 

• Chemical Weathering
• Erosion
• final layer Deposition

Rust that forms on rocks or metal because of extended exposure to oxygen is what example of chemical weathering?

• carbon dioxide (carbonic acid)
• acid rain
• oxidation
• lichens

How might a weathered mountain appear different than an unweathered mountain?

• Weathered mountain would be taller.
• Weathered mountain would be rounder and less jagged.
• Weathered mountain would be more jagged and less rounded.
• Weathered mountain would have no trees.

________ is the breakdown of rock into smaller pieces by physical means

• chemical weathering
• Mechanical weathering
• Erosion
• Deposition

Grand Canyon was formed by ?

• Wind
• Volcano
• Running water
• Earthquake

What is likely to cause cracks on the sidewalk?

• Repeated freezing and thawing of water
• Tree roots or plant roots growing bigger
• Both and A and B
• Neither A or B