weathering grade 9 geography

What is the weathering process in which rocks are broken down into smaller pieces (sediments) and do not change the rock composition?

• chemical weathering

• mechanical weathering

• acid rain

• oxidation

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

• water - It can carry acid and dissolve rock

• wind - It displaces rocks

• exfoliation - New cracks give chemical reactions the chance to operate

• Erosion - Moves the rocks from one place to another

This type of weathering occurs when rock is physically broken down into smaller pieces of rock.

• mechanical weathering

• chemical weathering

• erosion

• deposition

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

A marble statue is left exposed to the weather.  Within a few years, the details on the statue have begun to weather away.  This weathering probably is caused by...

• oxygen in the air
• carbonic acid in rainwater
• lichens
• abrasion

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

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.

Which is NOT a factor in the rate of weathering

• Precipitation
• Rock Composition
• Temperature
• Altitude 

Which type of weathering results when oxidation (rusting) occurs?

• Biological

• Chemical

• Mechanical

What type of weathering is occurring in this picture?

• Mechanical

• Chemical

• Biological