Weathering

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

Which of the following is an example of chemical weathering?

• Acid rain dissolving limestone
• roots breaking into concrete
• paper being ripped
• Water running over rocks

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

All of the following are causes of physical weathering except...

• plant growth
• wind
• acid rain
• running water

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.

Weathering can change roads, sidewalks, buildings and sculptures over time.

• False
• True

Mechanical weathering breaks down existing rocks by

• Changing them chemically, but not physically.
• Changing them physically, but not chemically.
• Changing them chemically and physically.
• Incorporating them into new rocks.

Chemical weathering does not change the mineral composition of the weathered rock.

• True
• False

What happens to a rock when it weathers?

• It settles out of water that is carrying it.
• It creates a valley.
• It forms a delta.
• It breaks into small pieces.

Freezing causes

• physical weathering.
• chemical weathering.
• both chemical and physical weathering.
• neither chemical or physical weathering.