Weathering Quiz

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

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

What is the relationship between surface area and the rate of weathering?

• As surface area increases, the rate of weathering decreases
• As surface area increases, the rate of weathering increases
• As surface area decreases, the rate of weathering increases
• There is no relationship

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.

Which of the following is the most important agent of chemical weathering to form this cave?

• Water - It can carry acid and dissolve rock
• Erosion - Moves the rocks from one place to another
• Wind - It displaces rocks
• Exfoliation - New cracks give chemical reactions the chance to operate

The formation of stalactites and stalagmites in a cave as water mixed with carbon dioxide creates carbonic acid, which dissolves away the limestone, is an example of:

• mechanical weathering
• chemical weathering

Potholes forming in the road after a cold winter is an example of:

• mechanical weathering
• chemical weathering

How is mechanical weathering different from chemical weathering?

• Chemical weathering happens over much shorter time frame than mechanical weathering.
• Chemical weathering changes the chemical composition of rocks; mechanical weathering does not.
• Chemical weathering occurs only in tropical climates; mechanical weathering occurs only in cool climates.
• Chemical weathering occurs only in the mountains; mechanical weathering occurs only on flat land.

Freshwater smoothing out rock in a river.

• Mechanical Weathering

• Chemical Weathering