Chapter 10 Flashcards
After granite has weathered and most of the igneous minerals have been altered to other minerals, which igneous mineral will probably NOT have been affected?
quartz
The minerals hematite and limonite result from the chemical weathering of iron-rich minerals like olivine or pyrite by what process?
oxidation
Which of the following common rocks would be most susceptible to chemical weathering?
Limestone
Chemical weathering would progress most rapidly in which location?
northern South America
How is ice wedging important in preparing rocks for chemical weathering?
It enlarges fractures and cracks, thereby increasing the surface area of the rock
The general term for the blanket of loose rock debris that covers large areas of Earth’s surface is
regolith
A talus accumulation consists largely of
coarse, angular rock fragments
Which of the following is NOT a type of physical weathering?
conversion of feldspar minerals to clay and soluble material
Ice wedging would be most effective in
areas where freezing and thawing occur many times a year
Weathering is a near-surface phenomenon, but in some regions chemical decomposition may operate tens of meters below the surface if
the rocks are highly fractured
How climate effects weathering.
Deserts lower rate of weathering
Dissolution-
Rock dissolves into water and then transported leaves behind evaporite
Oxidation-
interaction between oxygen and other ion- strips away electron
Suspension-
really fine particles hanging with water
Rolling-
Big chunk being pushed by water
