Name:     ID: 
 
Email: 

Chap 7 Weathering & Erosion

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

 1. 

Soil is a mixture of weathered rock, mineral fragments, water, air and ____.
a.
sand
c.
moss
b.
decayed organic matter
d.
clay
 

 2. 

The layer of soil that contains the most organic material is called the ____ horizon.
a.
A
c.
C
b.
B
d.
D
 

 3. 

Which of these does NOT cause mechanical weathering?
a.
ice
c.
burrowing animals
b.
tree roots
d.
carbonic acid
 

 4. 

Litter often covers the ____ horizon.
a.
A
c.
C
b.
B
d.
all of the above
 

 5. 

Chemical weathering, such as rusting, happens faster in what kind of climate?
a.
warm, dry
c.
cold, dry
b.
warm, wet
d.
cold, wet
 

 6. 

The organic matter in humus is made of ____.
a.
dead worms
c.
roots
b.
stems
d.
all of the above
 

 7. 

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

 8. 

On steep slopes and mountains, ____ helps reduce erosion by creating level areas for crops.
a.
a shelter belt
c.
mulching
b.
strip cropping
d.
terracing
 

 9. 

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
 

 10. 

Minerals found in the B horizon were dissolved in water and carried there by a process called ____.
a.
oxidation
c.
weathering
b.
leaching
d.
littering
 

 11. 

The B horizon is ____.
a.
rockier than the C horizon
c.
lighter in color than the A horizon
b.
richer in humus than the A horizon
d.
thinner than the C horizon
 

 12. 

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
 

 13. 

Chemical weathering ____.
a.
is caused by freezing and thawing
b.
breaks apart rocks by physical processes
c.
occurs when chemical reactions dissolve or change the minerals in rocks
d.
none of above
 

 14. 

In areas where freezing and thawing occur frequently, rocks weather rapidly because of
a.
evaporation
c.
carbonic acid
b.
ice wedging
d.
soil leaching
 

 15. 

When water mixes with carbon dioxide gas in the air or soil, ____ forms.
a.
carbonic acid
c.
calcite
b.
lactic acid
d.
oxygen
 

 16. 

Most farmers in Georgia use this method for farming, but it can cause soil erosion.
a.
Grazing
c.
Conventional Plowing
b.
No-tilling farming
d.
Terracing
 

 17. 

Soil erosion occurs ____.
a.
where animals eat away all the plants
c.
on steep slopes
b.
when forests are removed
d.
all of the above
 

 18. 

When farmers leave plant stalks in the field to reduce soil erosion, it is called ____.
a.
contour farming
c.
no-till farming
b.
plowing
d.
terracing
 

 19. 

     
Surface processes that work to break down rock into sediment are called__________.
a.
erosion
c.
ice wedging
b.
weathering
d.
oxidation
 

 20. 

Why is ice wedging most obvious in the mountains?
a.
because the altitude directly contributes to how the water freezes in the cracks of rocks
c.
because the pressure in the mountains allows for the repeated freezing and thawing of water caught in cracks of rocks
b.
because gravity pulls on the water in the cracks more if its found higher in the mountains
d.
because the temperature changes in the mountains allow for the repeated freezing and thawing of water caught in cracks of rocks
 

 21. 

Erosion is more common on
a.
steep slopes and mountain sides
c.
in valleys
b.
level ground
d.
on gently sloping hills
 

 22. 

How does soil erosion damage topsoil?
a.
it makes it more fertile
c.
it washes it away
b.
it keeps it moist
d.
it moves the topsoil to other areas where it is more needed
 

 23. 

What type of farming uses steps built into the sides of steep hillsides?
a.
contour plowing
c.
no till farming
b.
terraces
d.
conventtional plowing
 

 24. 

In this type of farming, farmers plant new crops on top of the old crops without plowing.
a.
terraces
c.
conventional plowing
b.
irrigation
d.
no till farming
 

 25. 

This is the process where rocks are physically broken into sediment that is identical to the parent rock, the pieces are just smaller.
a.
chemical weathering
c.
mechanical weathering
b.
soil erosion
d.
soil horizons
 



 
         Start Over