Chemical/mechanical 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.

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

• chemical weathering 
• physical or mechanical weathering
• erosion

Picture A is a mountain in the Sierra Nevada. Picture B shows only the west ridge of the mountain range.  What is the most likely reason for the shape of picture B?

• It was hit by a volcanoe
• Chemical weathering
• mechanical weathering
• it was caused by an earthquake

What is sediment?

• a chemical reaction
• tiny pieces of weathered rock carried by wind or water
• pollution

Acid rain is most likely to cause...

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

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