Chemical and Physical Weathering

During chemical weathering, what can happen to the type of rock that has undergone chemical weathering?

• a new rock is produced that is larger than the original rock
• a new rock is produced that is the same as the original rock
• a new rock is produced that is different from the original rock 
• no new rock is created - it is just smaller in size

What kind of weathering is occurring in this picture ?

• chemical weathering
• physical weathering

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

• chemical
• physical

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

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

• plant growth
• wind
• carbonic acid
• running water

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

What is physical weathering?

• Rocks are broken into smaller pieces without changing their composition.
• Rocks are broken down through chemical changes.
• Rocks are worn away from acid in plant roots.
• Rocks broken down by machinery.

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

• True
• False

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

• False
• True

Chemical weathering

• May change the composition of a piece of rock, but definitely changes the size.
• Is no different from physical weathering in changing rocks.
• Is much less important than physical weathering because it acts under very few conditions.
• May change the size of a piece of rock, but definitely changes the composition.