Chapter 5
The process that occurs when physical forces break rock into smaller pieces without changing the rocks chemical composition is called ?
weathering and erosion
What is the weathering processes involving the constant freezing and thawing of water ?
frost wedging
What are the processes of mechanical weathering ?
frost wedging,unloading,and biological activity
When water freezes its volume
increases
Which of the following is the result of chemical weathering ?
a rock has been split in two
What kind of weathering would cause the writing on a marble gravestone to become harder and harder to read over time ?
chemical weathering
A soils texture is determined by ?
percentage of clay,silt,and sand
The main source of organic matter soil is ?
Plants
A soil that is characteristic of the humid eastern United States is ?
Pedalfer
A soil associated with the hot and wet tropics ?
laterite
Which of the following human activities has caused an increase in soil erosion ?
farming,logging,and construction
The process responsible for moving material down-slope under the influence of gravity is called ?
mass movement
What is the force behind mass movement ?
gravity
What is the slowest type of mass movement ?
creep
What is responsible for the formation of exfoliation domes ?
unloading
The gradual rounding of the corners and edges of angler blocks of rock is called ?
spheroidal weathering
The process called____involves physical forces that break rock into smaller pieces ?
mechanical weathering
In figure 5-2 what is the layer labeled Y composed of ?
unweathered parent material
In the process of ___,water freezes and expands,enlarging cracks in rocks
frost wedging
A large pile of debris that forms at the base of a slope is called ?
talus
The most important agent of chemical weathering is ?
water
The layer of rock and mineral fragments produced by weathering,and covering nearly all of Earths land surface is called ?
regolith
Haman activities that remove vegatation have resulted in an
increase
The force that drives mass movements is
gravity
List three factors that affect the rate of weathering ?
Surface Area

Rock Composition

Climate

How are soils classified based on texture ?
clay,silt,and sand in soil
si
What are the 3 processes that break rocks into smaller pieces during mechanical weathering ?
frost wedging,unloading,and biological weathering
Use figure 5-1 to determine what soil is called if it has 20% clay.,60% silt,and 20% sand
silty loan
In well developed soil profile which horizon is the uppermost level ?
A horizon
In figure 5-2 what is layer is labeled x ?
mineral matter mixed with some organic matter
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