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study Guide
ch 5
35
Environmental Studies
9th Grade
03/14/2013

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Cards

Term
What is mechanical weathering ?
Definition
when physical forces break rock into smaller and smaller pieces without changing the rocks mineral composition
Term
What is frost wedging ?
Definition
when water freezes and expands it enlarges the cracks after many freeze thaw cycles the rocks break into pieces
Term
when water freezes its volume __
Definition
increases
Term
Which of the following is NOT associated with mechanical weathering ?
Definition
reactions with oxygen
Term
What is chemical weathering ?
Definition
Is the transformation of rock into one or more new compounds
Term
Which of the following is the result of chemical weathering?
Definition
a rock that has been changed into one or more new compounds
Term
The atmospheric gas that forms a mild acid when dissolved in water is ?
Definition
carbon dioxide
Term
What would cause the inscription on a marble gravestone to become harder and harder to read over time ?
Definition
chemical weathering
Term
What climate does chemical weather favor the most ?
Definition
warm and wet
Term
What are major components of soil ?
Definition
mineral matter,organic matter,water,and air
Term
A soils texture is determined by ?
Definition
You use categories of clay,silt,and sand in the soil
Term
The main source of organic matter in soil is ?
Definition
Plants
Term
A soil associated with the hot and wet tropics is ?
Definition
laterite
Term
Pedalfer soils contain high amounts of ?
Definition
iron oxide and aluminum-rich clays
Term
The process responsible for moving material down slope under the influence of gravity is ?
Definition
mass movement
Term
What is the force behind mass movement ?
Definition
gravity
Term
A mass movement that involves the sudden movement of a block of material along a flat inclined surface is called a ?
Definition
rockslides
Term
Which of these factors affects the rate of weathering ?
Definition
climate,chemical composition,of the exposed rock,surface area of the exposed rock
Term
Use figure 5-1 to determine what soil is called if it has 20% clay,60% silt,and 20% sand ?
Definition
silty loan
Term
What are proportions of clay,silt,and sand shown at point B in figure 5-1 ?
Definition
Clay 20%,silt 40%,sand 40%
Term
What are proportions of clay,silt,and sand shown at point A in figure 5-1 ?
Definition
clay 60%,silt 20%,sand 20%
Term
What are proportions of clay,silt,and sand shown at point C in figure 5-1 ?
Definition
clay 10%,silt 20%,sand 70%
Term
Why can the removal of vegetation trigger mass movements ?
Definition
the pant roots bind the soil and regolith roots
Term
In the process of _______,water freezes and expands,enlarging cracks in rocks
Definition
frost wedging
Term
A large pile of debris that forms at the base of a slope is called ?
Definition
Talus
Term
What is the most important agent of chemical weathering ?
Definition
water
Term
What is regolith ?
Definition
Layer of rock and mineral fragments which covers nearly all of the Earths land surface
Term
The force that drives mass movements is ?
Definition
gravity
Term
What is the content in the soil type Pedocal ?
Definition
Abundant calcite or calcium carbonate and are typically light grey-brown
Term
What is the location and content of the soil type Latrite ?
Definition
Found in hot wet tropical areas.Iron oxides and aluminum oxides are present
Term
One of the most dramatic triggers of sudden mass movements is an ?
Definition
earthquakes
Term
_____the slowest type of mass movements involves the lifting and contracting of soil particles over time ?
Definition
Creep
Term
What are the three factors that affect the rate of weathering ?
Definition
Mechanical weathering,rock characteristics,and climate
Term
How are soils classified based on texture ?
Definition
You use percentages of clay,silt,and sand
Term
Explain the three processes that break rocks into smaller pieces during mechanical weathering ?
Definition
Frost wedging,unloading.and biological activity
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