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Mechanicalweathering

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

Mechanical weathering ____.
a.
breaks apart rocks by physical processes
b.
occurs when chemical reactions dissolve or change the minerals in rocks
c.
occurs when iron is exposed to oxygen and water
d.
none of the above
 

 2. 

When Joe saw the Rocky Mountains for the first time, he said, “These mountains are much younger than the mountains in North Georgia.”  How could he know this?
a.
their sedimentary layers are still exposed
c.
they are taller so they are actually older
b.
the Rocky Mountains have tall rugged tops from long-term weathering
d.
the North Georgia Mountains have rounded tops from long-term weathering
 

 3. 

The major process that wears down whole mountain ranges is
a.
earthquakes
c.
plate movement
b.
weathering
d.
silt deposition
 

 4. 

Ice wedging is caused by ____.
a.
carbonic acid freezing on rocks
c.
water freezing and thawing
b.
water and oxygen reacting
d.
rocks colliding with each other
 

 5. 

The rock, mineral fragments, and sediment in soil comes from rock that has been ____.
a.
blasted
c.
weathered
b.
carved
d.
chemically treated
 

 6. 

In cold climates rocks are broken into pieces by the action of water.  This process that breaks down rocks and helps form soil can best be explained by
a.
leaching of minerals from the rock
c.
chemical weathering due to water and oxidation
b.
decomposition due to the action of ice crystals
d.
mechanical weathering due to freezing and thawing
 

 7. 

Which of these usually causes mechanical weathering but some also cause chemical weathering?
a.
animals burrowing
c.
oxidation
b.
plants
d.
carbonic acid
 

 8. 

mc008-1.jpg
Over time this rocky cliff will become many smaller rocks and eventually become sand.  This process is
a.
erosion
c.
weathering
b.
deposition
d.
uniformitarianism
 

 9. 

When rocks undergo weathering, they become
a.
magma
c.
sediment
b.
igneous rocks
d.
volcanic cones
 

 10. 

All of the following cause mechanical weathering EXCEPT ____.
a.
ice
c.
burrowing animals
b.
tree roots
d.
carbonic acid
 



 
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